Open source software
277663
225588876
2008-07-14T13:11:02Z
SebastianBreier
55101
[[WP:UNDO|Undid]] revision 225355525 by [[Special:Contributions/119.67.217.30|119.67.217.30]] ([[User talk:119.67.217.30|talk]]) Vandal
{{expert-subject|Free Software}}
[[Image:Opensource.svg|thumb|The logo of the [[Open Source Initiative]]]]
{{otheruses|open source}}
'''Open source software''' (OSS) began as a marketing campaign for [[free software]].<ref>http://web.archive.org/web/20060423094434/www.opensource.org/advocacy/faq.html</ref> OSS can be defined as [[computer software]] for which the human-readable [[source code]] is made available under a [[copyright]] [[license]] (or arrangement such as the [[public domain]]) that meets the [[Open Source Definition]]. This permits users to use, change, and improve the software, and to redistribute it in modified or unmodified form. It is very often developed in a public, collaborative manner. Open source software is the most prominent example of [[open source]] development and often compared to [[user generated content]].<ref>{{cite web |last=Verts |first=William T. |title=Open source software |work=[[World Book Encyclopedia|World Book]] Online Reference Center |date=[[2008-01-13]] |url=http://www.worldbookonline.com/wb/Article?id=ar751706}}</ref>
==History==
{{Refimprovesect|date=November 2007}}
{{main|Open source movement}}
The [[free software movement]] was launched in 1983. In 1998, a group of individuals advocated that the term [[free software]] be replaced by open source software (OSS) as an expression which is less ambiguous and more comfortable for the corporate world.<ref>{{cite web | url = http://www.catb.org/~esr/open source.html | title = Goodbye, "free software"; hello, "open source" | author = Eric S. Raymond| date= 1998-02-08 | accessdate = 2007-02-14}}</ref> Software developers may want to publish their software with an [[open source license]], so that anybody may also develop the same software or understand how it works. Open source software generally allows anyone to make a new version of the software, port it to new operating systems and processor architectures, share it with others or market it. The aim of open source is to let the product be more understandable, modifiable, duplicatable,reliable or simply accessible, while it is still marketable.
The [[Open Source Definition]], notably, presents an open source philosophy, and further defines a boundary on the usage, modification and redistribution of open source software. [[Software license]]s grant rights to users which would otherwise be prohibited by [[copyright]]. These include rights on usage, modification and redistribution. Several open source software licenses have qualified within the boundary of the Open Source Definition. The most prominent example is the popular [[GNU General Public License]] (GPL). While open source presents a way to broadly make the sources of a product publicly accessible, the open source licenses allow the authors to fine tune such access.
The "open source" label came out of a strategy session held in [[Palo Alto, California|Palo Alto]] in reaction to [[Netscape Communications Corporation|Netscape's]] January 1998 announcement of a source code release for [[Netscape Navigator|Navigator]] (as [[Mozilla]]). A group of individuals at the session included Todd Anderson, Larry Augustin, John Hall, Sam Ockman, Christine Peterson and [[Eric S. Raymond]]. They used the opportunity before the release of Navigator's source code to clarify a potential confusion caused by the ambiguity of the word "free" in [[English language|English]]. The 'open source' movement is generally thought to have begun with this strategy session. Many people, nevertheless, claimed that the birth of the [[Internet]], since [[1969]], started the open source movement, while others do not distinguish between open source and free software movements.
The [[Free Software Foundation]] (FSF), started in 1985, intended the word 'free' to mean "free as in free speech" and not "free as in free beer" with emphasis on the positive ''freedom to'' distribute rather than a negative ''freedom from'' cost. Since a great deal of free software already was (and still is) free of charge, such free software became associated with zero cost, which seemed anti-commercial.
The [[Open Source Initiative]] (OSI) was formed in February 1998 by Eric S. Raymond and [[Bruce Perens]]. With at least 20 years of evidence from case histories of closed development versus open development already provided by the Internet, the OSI presented the 'open source' case to commercial businesses, like Netscape. The OSI hoped that the usage of the label "open source," a term suggested by Peterson of the [[Foresight Institute]] at the strategy session, would eliminate ambiguity, particularly for individuals who perceive "free software" as anti-commercial. They sought to bring a higher profile to the practical benefits of freely available source code, and they wanted to bring major software businesses and other high-tech industries into open source. Perens attempted to register "open source" as a [[service mark]] for the OSI, but that attempt was impractical by [[trademark]] standards. Meanwhile, thanks to the presentation of Raymond's paper to the upper management at Netscape (Raymond only discovered when he read the [http://wp.netscape.com/newsref/pr/newsrelease558.html Press Release], and was called by Netscape CEO Jim Barksdale's PA later in the day), Netscape released its Navigator source code as open source, with favorable results.
==Philosophy==
<!-- Image with inadequate rationale removed: [[Image:Cathedral-and-the-Bazaar-book-cover.jpg|thumb|[[The Cathedral and the Bazaar]] book cover]] -->
In his 1997 essay [[The Cathedral and the Bazaar]],<ref name="ray2000">{{cite web |last=Raymond |first=Eric |date=[[2000-09-11]] |title=[[The Cathedral and the Bazaar]] |accessdate=2004-09-19 |url=http://www.catb.org/~esr/writings/cathedral-bazaar/cathedral-bazaar/index.html}}</ref> [[open source evangelist]] [[Eric S. Raymond]] suggests a model for developing OSS known as the Bazaar model. Raymond likens the development of software by traditional methodologies to building a cathedral, "''carefully crafted by individual wizards or small bands of mages working in splendid isolation''".<ref name="ray2000" /> He suggests that all software should be developed using the bazaar style, which he described as "''a great babbling bazaar of differing agendas and approaches''."
In the Cathedral model, development takes place in a centralized way.
Roles are clearly defined. Roles include people dedicated to designing (the architects), people responsible for managing the project, and people responsible for implementation. Traditional software engineering follows the Cathedral model. [[Fred Brooks|Fred P. Brooks]] in his book ''[[The Mythical Man-Month]]'' advocates this sort of model. He goes further to say that in order to preserve the architectural integrity of a system, the system design should be done by as few architects as possible.
The Bazaar model, however, is different. In this model, roles are not clearly defined. Gregorio Robles<ref>{{cite book |last=Robles |first=Gregorio |year=2004 |chapter=A Software Engineering approach to Libre Software |accessdate=2005-04-20 |chapterurl=http://www.opensourcejahrbuch.de/2004/pdfs/III-3-Robles.pdf |format=PDF |title=Open Source Jahrbuch 2004 |editor=Robert A. Gehring, Bernd Lutterbeck |location=Berlin |publisher=Lehmanns Media}}</ref> suggests that software developed using the Bazaar model should exhibit the following patterns:
; Users should be treated as co-developers: The users are treated like co-developers and so they should have access to the source code of the software. Furthermore users are encouraged to submit additions to the software, code fixes for the software, bug reports, documentation etc. Having more co-developers increases the rate at which the software evolves. [[Linus's law]] states that, "Given enough eyeballs all bugs are shallow." This means that if many users view the source code they will eventually find all bugs and suggest how to fix them. Note that some users have advanced programming skills, and furthermore, each user's machine provides an additional testing environment. This new testing environment offers that ability to find and fix a new bug.
; Early releases: The first version of the software should be released as early as possible so as to increase one's chances of finding co-developers early.
; Frequent integration: New code should be integrated as often as possible so as to avoid the overhead of fixing a large number of bugs at the end of the project life cycle. Some open source projects have nightly builds where integration is done automatically on a daily basis.
; Several versions: There should be at least two versions of the software. There should be a buggier version with more features and a more stable version with fewer features. The buggy version (also called the development version) is for users who want the immediate use of the latest features, and are willing to accept the risk of using code that is not yet thoroughly tested. The users can then act as co-developers, reporting bugs and providing bug fixes.
; High modularization: The general structure of the software should be modular allowing for parallel development.
; Dynamic decision making structure: There is a need for a decision making structure, whether formal or informal, that makes strategic decisions depending on changing user requirements and other factors. Cf. [[Extreme programming]].
Most well known OSS products follow the Bazaar model as suggested by Eric Raymond. These include projects such as [[Linux]], [[Firefox]], [[Apache HTTP Server|Apache]], the [[GNU Compiler Collection]], and [[Perl]] to mention a few.
==Licensing==
{{Unreferencedsection|date=November 2007}}
{{main|Open source license}}
Open source licenses define the privileges and restrictions a licensor must follow in order to use, modify or redistribute the open source software. Open source software includes software with source code in the [[public domain]] and software distributed under an open source license.
Examples of open source licenses include [[Apache License]], [[BSD license]], [[GNU General Public License]], [[GNU Lesser General Public License]], [[MIT License]], [[Eclipse Public License]] and [[Mozilla Public License]].
The proliferation of open source licenses is one of the few negative aspects of the open source movement because it is often difficult to understand the legal implications of the differences between licenses.
==Funding==
{{See also|Commercial open source applications}}
Given the basic fact that OSS can be given away free, a number of alternative models for funding its development other than from the basic profit from selling a software license, have emerged. Independent developers or companies may benefit from consultancy fees or charging for services related to the end use of the software, such as training. Several free OSS packages may have 'professional' versions which have enhanced capabilities and are sold commercially. Several governments and public authorities have chosen to fund open source development companies for their software needs, rather than pay for commercial licenses. Many [[commercial open source applications]] are developed and distributed by companies as a combination of both open and closed source components. In this case, the company benefits from the availability of OSS, and thus in turn may end up funding OSS maintenance and upgrades when it benefits their application as a whole.
==Open source versus closed source==
{{Unreferencedsection|date=November 2007}}
{{main|Comparison of open source and closed source}}
The debate over ''open source'' vs. ''[[closed source]]'' (alternatively called [[proprietary software]]) is sometimes heated.
One source of conflict is related to economics: Making money through traditional methods, such as sale of the use of individual copies and patent royalty payment (generally called ''licensing''), is more difficult and in many ways against the very concept of open source software.
Some closed-source advocates see open source software as damaging to the market of commercial software. This is one of the many reasons, as mentioned above, that the term ''free software'' was replaced with ''open source'' — because many company executives could not believe in a product that did not participate economically in a free-market or mixed-market economy. In addition, if something goes wrong there is the difficult question of who is liable.
The counter to this argument is the use of open source software to fuel the market for a separate product or service. For example:
* Providing support and installation services; similar to IT Security groups, Linux Distributions, and Systems companies.
* Using the software as a stepping stone to sell a higher-end product or service; e.g., [[OpenOffice.org]] vs. [[StarOffice]].
* Cost avoidance / cost sharing: many developers need a product, so it makes sense to share development costs ([[X Window System]] and the Apache web server)
Another major argument is software defects and security:
This is an argument that applies to all open products not just open source software.
Since Open Source software is open, all of the defects and security flaws are easily found. Closed-source advocates argue that this makes it easier for a malicious person to discover security flaws. Further, that there is no incentive for an open-source product to be patched. Open-source advocates argue that this makes it easier also for a patch to be found and that the closed-source argument is [[security through obscurity]], which this form of security will eventually fail, often without anyone knowing of the failure. Further, that just because there is not an immediate financial incentive to patch a product, does not mean there is not any incentive to patch a product. Further, if the patch is that significant to the user, having the source code, the user can technically patch the problem themselves. These arguments are hard to prove. However, most studies show that open-source software does have a higher flaw discovery, quicker flaw discovery, and quicker turn around on patches.
==Open source software versus free software==
{{Refimprovesect|date=July 2007}}
{{main|Alternative terms for free software}}
Critics have said that the term “open source” fosters an ambiguity of a different kind such that it confuses the mere availability of the source with the freedom to use, modify, and redistribute it. Developers have used the [[alternative terms for free software|alternative terms]] ''Free/open source Software'' (FOSS), or ''Free/Libre/open source Software'' (FLOSS), consequently, to describe open source software which is also free software.
The term “Open Source” was originally intended to be trademarkable; however, the term was deemed too descriptive, so no trademark exists.<ref>{{cite web
|url = http://opensource.org/docs/certification_mark.html
|title = Certification Mark
|accessdate = 2007-07-22
|last = Nelson
|first = Russell
|authorlink = Russ Nelson
|date= 2007-03-2
|publisher = The Open Source Initiative (OSI)
}}</ref> The OSI would prefer that people treat Open Source as if it were a trademark, and use it only to describe software licensed under an OSI approved license.<ref>{{cite web
|url = http://www.opensource.org/pressreleases/osi-launch.php
|title = OSI Launch Announcement
|accessdate = 2007-07-22
|last = Raymond
|first = Eric S.
|authorlink = Eric S. Raymond
|date= 1998-11-22
|publisher = The Open Source Initiative (OSI)
}}</ref> .
There have been instances where software vendors have labeled [[proprietary software]] as “open source” because it interfaces with popular OSS (such as Linux).{{Fact|date=July 2007}} Open source advocates consider this to be both confusing and incorrect. '''OSI Certified''' is a trademark licensed only to people who are distributing software licensed under a license listed on the [[Open Source Initiative]]'s list.<ref>{{cite web
|url = http://opensource.org/licenses
|title = Open Source Licenses by Category
|accessdate= 2007-07-22
|last = Nelson
|first = Russell
|authorlink = Russ Nelson
|date= 2006-09-19
|publisher = The Open Source Initiative (OSI)
}}</ref>
Open source software and free software are different terms for software which comes with certain rights, or freedoms, for the user. They describe two approaches and [[philosophy|philosophies]] towards free software. ''Open source'' and ''free software'' (or ''software libre'') both describe software which is free from onerous licensing restrictions. It may be used, copied, studied, modified and redistributed without restriction. Free software is not the same as [[freeware]], software available at zero price.
The definition of open source software was written to be almost identical to the [[free software definition]].<ref name="Stallman20070616">{{cite web
|url = http://www.gnu.org/philosophy/open source-misses-the-point.html
|title = Why “Open Source” misses the point of Free Software
|accessdate = 2007-07-23
|last = Stallman
|first = Richard
|authorlink = Richard Stallman
|date= 2007-06-16
|work = Philosophy of the GNU Project
|publisher = GNU Project
}}</ref> There are very few cases of software that is free software but is not open source software, and vice versa. The difference in the terms is where they place the emphasis. “Free software” is defined in terms of giving the user freedom. This reflects the goal of the [[free software movement]]. “Open source” highlights that the source code is viewable to all and proponents of the term usually emphasize the quality of the software and how this is caused by the development models which are possible and popular among free and open source software projects.
Free software licenses are not written exclusively by the FSF. The FSF and the OSI both list licenses which meet their respective definitions of free software. open source software and free software share an almost identical set of licenses.{{Fact|date=July 2007}} One exception is an early version of the [[Apple Public Source License]], which was accepted by the OSI but rejected by the FSF because it did not allow private modified versions; this restriction was removed in later version of the license.{{Fact|date=July 2007}} There are now new versions that are approved by both the OSI and the FSF.
The Open Source Initiative believes that more people will be convinced by the experience of freedom.{{Fact|date=July 2007}} The FSF believes that more people will be convinced by the concept of freedom. The FSF believes that knowledge of the concept is an essential requirement,<ref name="Stallman20070619">{{cite web
|url = http://www.gnu.org/philosophy/free-software-for-freedom.html
|title = Why “Free Software” is better than “Open Source”
|accessdate = 2007-07-23
|last = Stallman
|first = Richard
|authorlink = Richard Stallman
|date= 2007-06-19
|work = Philosophy of the GNU Project
|publisher = GNU Project
}}</ref><ref name="Stallman20070616"/> insists on the use of the term ''free'',<ref name="Stallman20070619"/><ref name="Stallman20070616"/> and separates itself from the open source movement.<ref name="Stallman20070619"/><ref name="Stallman20070616"/> The Open Source Initiative believes that ''free'' has three meanings: free as in beer, free as in freedom, and free as in unsellable.{{Fact|date=July 2007}} The problem with the term “open source” is it says nothing about the freedom to modify and redistribute, so it is used by people who think that source access without freedom is a sufficient definition. This possibility for misuse is the case for most of the licences that make up Microsoft's “[[shared source]]” initiative.
== Open source versus source-available ==
Although the OSI definition of "open source software" is widely accepted, a small number of people and organizations use the term to refer to software where the source is available for viewing, but which may not legally be modified or redistributed. Such software is more often referred to as ''source-available'', or as ''[[shared source]]'', a term coined by Microsoft in opposition to open source.
[[Michael Tiemann]], president of OSI, had criticized<ref>{{cite web
| url=http://www.opensource.org/node/163
| title=Will The Real Open Source CRM Please Stand Up?
| first=Michael
| last=Tiemann
| date=[[2007-06-21]]
| accessdate=2008-01-04
}}</ref> companies such as [[SugarCRM]] for promoting their software as "open source" when in fact it did not have an OSI-approved license. In [[SugarCRM]]'s case, it was because the software is so-called "[[badgeware]]"<ref>{{cite web
| url=http://blogs.zdnet.com/BTL/index.php?p=3430
| date=[[2006-11-21]]
| title=Are SugarCRM, Socialtext, Zimbra, Scalix and others abusing the term “open source?”
| first=David
| last=Berlind
| accessdate=2008-01-04
}}</ref> since it specified a "badge" that must be displayed in the user interface ([[SugarCRM]] has since switched to [[GPLv3]]<ref>{{cite web
| last=Vance
| first=Ashlee
| author-link=Ashlee Vance
| date=[[2007-07-25]]
| title=SugarCRM trades badgeware for GPL 3
| work=The Register
| url=http://www.regdeveloper.co.uk/2007/07/25/sugarcrm_gpl3/
}}</ref>). Another example is [[Scilab]], which calls itself "the open source platform for numerical computation"<ref>{{cite web
| url=http://www.scilab.org
| title=The open source platform for numerical computation
| accessdate=2008-01-04
}}</ref> but has a license<ref>{{cite web
| url=http://www.scilab.org/legal/license.html
| title=SCILAB License
| accessdate=2008-01-04
}}</ref> that forbids commercial redistribution of modified versions. Because OSI does not have a registered [[trademark]] for the term "open source", its legal ability to prevent such usage of the term is limited, but Tiemann advocates using public opinion from OSI, customers, and community members to pressure such organizations to change their license or to use a different term.
Other software that has source code available, but which is not open source, includes the [[pine]] email client, and the [[Microsoft Windows]] Operating System.{{Fact|date=May 2008}}
== Pros and cons of open source software ==
Software experts and researchers on open source software have identified several advantages and disadvantages. The main advantage for business is that open source is a good way for business to achieve greater penetration of the market. Companies that offer open source software are able to establish an industry standard and, thus, gain competitive advantage. It has also helped build developer loyalty as developers feel empowered and have a sense of ownership of the end product<ref>Srinarayan Sharma, Vijayan Sugumaran & Balaji Rajagopalan, “A framework for creating hybrid-open source software communities”, Info Systems Journal 12 (2002): 7–25</ref>. Moreover less costs of marketing and logistical services are needed for OSS. It also helps companies to keep abreast of all technology developments. It is a good tool to promote a companies’ image, including its commercial products<ref>“Profiting from Open Source”, Harvard Business Review (2002): 22</ref>. The OSS development approach has helped produce reliable, high quality software quickly and inexpensively. Besides, it offers the potential for a more flexible technology and quicker innovation. It is said to be more reliable since it typically has thousands of independent programmers testing and fixing bugs of the software. It is flexible because modular systems allow programmers to build custom interfaces, or add new abilities to it and it is innovative since open source programs are the product of collaboration among a large number of different programmers. The mix of divergent perspectives, corporate objectives, and personal goals speeds up innovation<ref>Hal Plotkin, “What (and Why) you should know about open-source software” Harvard Management Update 12 (1998): 8-9</ref>. Moreover free software can be developed in accord with purely technical requirements. It does not require to think about commercial pressure that often degrades the quality of the software. Commercial pressures make traditional software developers pay more attention to customers' requirements than to security requirements, since such features are somewhat invisible to the customer<ref>Christian Payne, “On the Security of Open Source Software”, Info Systems Journal 12 (2002): 61–78</ref>.
It is sometimes said that the open source development process may not be well defined and the stages in the development process, such as system testing and documentation may be ignored. However this is only true for small (mostly single programmer) projects. Larger, successful projects do define and enforce at least some rules as they need them to make the teamwork possible.<ref>http://www.gnu.org/software/classpath/docs/hacking.html</ref><ref>http://jgap.sourceforge.net/doc/codestyle.html</ref> In the most complex projects these rules may be as strict as reviewing even minor change by two independent developers.<ref>http://www.javalobby.org/java/forums/t98834.html</ref>
Not all OSS initiatives have been successful, for example, SourceXchange and Eazel<ref>Srinarayan Sharma, Vijayan Sugumaran & Balaji Rajagopalan, “A Framework for Creating Hybrid-Open Source Software Communities”, Info Systems Journal 12 (2002): 7–25</ref>. Software experts and researchers who are not convinced by open source’s ability to produce quality systems identify the unclear process, the late defect discovery and the lack of any empirical evidence as the most important problems (collected data concerning productivity and quality)<ref>Ioannis Stamelos, Lefteris Angelis, Apostolos Oikonomou & Georgios L. Bleris, “Code Quality Analysis in Open Source Software Development” Info Systems Journal 12 (2002): 43–60</ref>. It is also difficult to design a commercially sound business model around the open source paradigm. Consequently, only technical requirements may be satisfied and not the ones of the market<ref>Ioannis Stamelos, Lefteris Angelis, Apostolos Oikonomou & Georgios L. Bleris, “Code Quality Analysis in Open Source Software Development” Info Systems Journal 12 (2002): 43–60</ref>. In terms of security, open source may allow hackers to know about the weaknesses or loopholes of the software more easily than closed-source software. It is depended of control mechanisms in order to create effective performance of autonomous agents who participate in virtual organizations<ref>Michael J. Gallivan, “Striking a Balance Between Trust and Control in a Virtual Organization: A Content Analysis of Open Source Software Case Studies”, Info Systems Journal 11 (2001): 277–304</ref>.
==Development tools==
{{Unreferencedsection|date=January 2008}}
In OSS development the participants, who are mostly volunteers, are distributed amongst different geographic regions so there is need for tools to aid participants to collaborate in source code development. Often these tools are also available as OSS.
[[Revision control]] systems such as [[Concurrent Versions System]] (CVS) and later [[Subversion (software)|Subversion]] (svn) are examples of tools that help centrally manage the source code files and the changes to those files for a software project.
Utilities that automate testing, compiling and bug reporting help preserve stability and support of software projects that have numerous developers but no managers, quality controller or technical support. Building systems that report compilation errors among different platforms include [[Tinderbox (software)|Tinderbox]]. Commonly used [[bugtracker]]s include [[Bugzilla]] and [[GNATS]].
Tools such as [[mailing lists]], [[Internet Relay Chat|IRC]], and [[instant messaging]] provide means of Internet communications between developers. The Web is also a core feature of all of the above systems. Some sites centralize all the features of these tools as a [[software development management system]], including [[GNU Savannah]], [[SourceForge]], and [[BountySource]].
==Projects and organizations==
{{examplefarm}}
* [[Apache Software Foundation]]
* [[Audacity]]
* [[Blender (software)|Blender]] — 3d modeling
* [[CodePlex]]
* [[Debian]]
* [[Drupal]] — Content Management System
* [[Eclipse Foundation]]
* [[Fedora Project]]
* [[FreeBSD]]
* [[Freedesktop.org]]
* [[Free Software Foundation]]
* [[FUSE ESB]], [[FUSE Message Broker]], [[FUSE Services Framework]] and [[FUSE Mediation Router]] — Supported versions of Apache projects
* [[GIMP]] — Image Editing similar to photoshop
* [[GNU]]
* [[Inkscape]] — Vector tool similar to illustrator
* [[Java (programming language)|Java]]
* [[JBoss]]
* [[KnowledgeTree]] — Document Management for Teams and Small to Medium-sized Organizations
* [[LibreSource]]
* [[Linux (kernel)|Linux]]
* [[Macaulay2]] — algebraic geometry and commutative algebra
* [[Miranda IM]] — multi-protocol [[Instant Messenger|IM]]
* [[Mozilla Foundation]]
* [[MySQL]]
* [[NetBSD]]
* [[OpenBSD]]
* [[Open-Xchange]]
* [[Open Market For Internet Content Accessibility]]
* [[OpenOffice.org]] — Word processor, spreadsheet, presentation tool, database, equation editor
* [[OpenSees]] — open system for earthquake engineering simulation
* [[OpenSuse]]
* [[Open Solutions Alliance]]
* [[Open Source Development Labs]]
* [[Open Source Initiative]]
* [[Open Source Geospatial Foundation]]
* [[PHP]] — scripting language primarily for web applications
* [[Povray]] — Ray Tracer
* [[Python (programming language)|Python]]
* [[Restore]] — RESTORE is an open source project for heterogeneous system backup and restore.
* [[Software for Algebra and Geometry Experimentation|SAGE]] — Magma computer algebra system
* [[Scribus]] — Desktop publishing similar to pagemaker
* [[SourceForge]] — Repository of open source software
* [[Subversion (software)]] — version control
* [[Synfig]] — 2d vector graphic and animation
* [[Typo3| TYPO3]] — Enterprise Level Content Management System
* [[Ubuntu (operating system)|Ubuntu]]
* [[Wireshark]]<ref>[http://www.eweek.com/c/a/Linux-and-Open-Source/The-Most-Important-OpenSource-Apps-of-All-Time/5/ The Most Important Open-Source Applications of All Time — eWeek]</ref> — network [[packet sniffer]] / network [[protocol analyser]]
* [[Zenoss]]
* [[Zimbra]] — email server
== See also ==
{{examplefarm}}
{{portal|Free software|Free Software Portal Logo.svg}}
{{wikibooks|Open Source}}
* [[Open access]]
* [[Open content]] for non-programming open source projects.
* [[Open Design]] — the application of open source principles to creating material objects and solutions.
* [[Open publishing]]
* [[Open source games]]
* [[Openness]] — the philosophical term
* [[Open source advocacy]]
* [[Open source movement]]
* [[Open source software security]]
* [[List of open source software packages]]
* [[Open system (computing)|Open system]]
* [[Open standard]]
* [[Open format]]
* [[OpenDocument]] The new OASIS OpenDocument format (ODF) to create an open system for business & public sector documents.
* [[Free software]]
* [[:Category:Free and open source software organizations|Free and open source software organizations]]
* [[Shared software]]
== References ==
{{refs|2}}
===Further reading===
*{{cite book |last=Lui |first=K.M. |coauthors=Chan, K.C.C. |year=2008 |title=Software Development Rhythms: Harmonizing Agile Practices for Synergy |publisher=[[John Wiley and Sons]] |isbn=978-0-470-07386-5}}
===Legal and economic aspects===
*[http://www.benkler.org/CoasesPenguin.PDF Benkler, Yochai (2002), “Coase's Penguin, or, Linux and The Nature of the Firm." Yale Law Journal 112.3 (Dec 2002): p367(78)] (in Adobe [[Portable Document Format|pdf]] format)
*{{cite book |last=v. Engelhardt |first=Sebastian |year=2008| |url=http://ideas.repec.org/p/jrp/jrpwrp/2008-045.html |title="The Economic Properties of Software", Jena Economic Research Papers, Volume 2 (2008), Number 2008-045 |format=PDF}}
*Lerner, J. & Tirole, J. (2002): ‘Some simple economics on open source’, Journal Of Industrial Economics 50(2), p 197–234
*{{cite book |first=Mikko |last=Välimäki |title=The Rise of Open Source Licensing: A Challenge to the Use of Intellectual Property in the Software Industry |publisher=Turre Publishing |year=2005 |url=http://pub.turre.com/openbook_valimaki.pdf |format=PDF}}
*{{cite paper |last=Polley |first=Barry |date=[[2007-12-11]] |url=http://nzoss.org.nz/system/files/moj_oss_strategy_1.0.pdf |title=Open Source Discussion Paper – version 1.0 |publisher=New Zealand Ministry of Justice |accessdate=2007-12-12 |format=PDF}}
*Rossi, M. A. (2006): Decoding the free/open source software puzzle: A survey of theoretical and empirical contributions, in J. Bitzer P. Schröder, eds, ‘The Economics of Open Source Software Development’, p 15–55. [http://ideas.repec.org/p/usi/wpaper/424.html, (download an online version)]
==External links==
{{linkfarm}}
* ComputerWorld article: [http://www.computerworld.com/action/article.do?command=viewArticleBasic&taxonomyName=development&articleId=9066615&taxonomyId=11&intsrc=kc_top Does the open-source development model work for business users?]
* [http://www.openknowledge.org/writing/open source/scb/brief-open source-history.html Brief History of the Open Source Movement]
* "the" [http://opensource.org/docs/definition.php definition of open source]
* [http://ec.europa.eu/idabc/en/document/7565/469 The European Parliament's IT department is testing the use of GNU/Linux distribution Ubuntu, OpenOffice, Firefox and other Open Source applications].
* {{dmoz|Computers/Open_Source|Open Source}}
* [http://www.opensource.org/ Open Source Initiative (OSI)] — a list of available licenses
* [http://www.oreilly.com/catalog/opensources/book/toc.html Open Sources: Voices from the Open Source Revolution] — an online book containing essays from prominent members of the open source community
* [http://www.gnu.org/philosophy/free-software-for-freedom.html Why "Free Software" is better than "Open Source"] — a later essay from [[Richard Stallman]]
* [http://opensource.mit.edu/online_papers.php Free / Open Source Research Community] — Many online research papers
* [http://video.google.com/videoplay?docid=1755108258049541143&q=duration%3Along January 2006 TPOSSCON talk:] "How OSS Improves Society" Aaron Siego speaks at the 2nd Trans-Pacific Open Source Software Conference in Honolulu, Hawaii.
* [http://www.dwheeler.com/oss_fs_why.html Why Open Source Software / Free Software (OSS/FS, FLOSS, or FOSS)? Look at the Numbers!] — large collection of related quantitative studies
* ''[http://www.oreillynet.com/pub/a/oreilly/opensource/news/scoville_0399.html Whence The Source: Untangling the Open Source/Free Software Debate]'', essay on the differences between Free Software and Open Source, by [[Thomas Scoville]]
*[http://www.linuxdevcenter.com/pub/a/linux/2006/11/09/degrees-of-openness.html Degrees of Openness] article explaining the different aspects of openness in computer systems, written by Adrien Lamothe, on the [http://www.oreillynet.com O'Reilly Network].
* [http://opensourcescripts.com/ Open Source Software] Software project.
* [http://www.slackbook.org/html/introduction-opensource.html Differences between open source and free software] as interpreted by [[Slackware]]
* [http://opensource.mit.edu/papers/berry1.pdf Berry, D M (2004). The Contestation of Code: A Preliminary Investigation into the Discourse of the Free Software and Open Software Movement, Critical Discourse Studies, Volume 1(1).]
* [http://ec.europa.eu/enterprise/ict/policy/doc/2006-11-20-flossimpact.pdf EU study on adopting FLOSS]
* [http://www.sci.brooklyn.cuny.edu/~bcfoss/DL Decoding Liberation: The Promise of Free and Open Source Software] by Samir Chopra and Scott Dexter
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[[Category:Digital Revolution]]
[[Category:Free software culture and documents]]
[[Category:Free software]]
[[Category:Software licenses]]
[[Category:Libre]]
[[cs:Open source software]]
[[de:Open Source]]
[[el:Λογισμικό ανοικτού κώδικα]]
[[es:Código abierto]]
[[fa:نرمافزار بازمتن]]
[[hi:ओपेन सोर्स सॉफ्टवेर]]
[[id:Perangkat lunak sumber terbuka]]
[[nl:open source software]]
[[ru:Открытое программное обеспечение]]
[[sl:Odprtokodna programska oprema]]
[[sr:Софтвер отвореног кода]]
[[th:โอเพนซอร์ซ]]
[[vi:Phần mềm nguồn mở]]
[[zh:开放源代码软件]]