Open source describes practices in production and development that promote access to the end product's sources. Some consider it as a philosophy, and others consider it as a pragmatic methodology. Before open source became widely adopted, developers and producers used a variety of phrases to describe the concept; the term open source gained popularity with the rise of the Internet and its enabling of diverse production models, communication paths, and interactive communities.The complexity of such communication relates to Brooks' law, and it is also described by Eric S. Raymond, "Brooks predicts that as your number of programmers N rises, work performed scales as N but complexity and vulnerability to bugs rises as N-squared. N-squared tracks the number of communications paths (and potential code interfaces) between developers' code bases." -- "The Revenge of the Hackers". 2000. Subsequently, open source software became the most prominent face of open source.
The open source model can allow for the concurrent use of different agendas and approaches in production, in contrast with more centralized models of development such as those typically used in commercial software companies.Raymond, Eric S. The Cathedral and the Bazaar. ed 3.0. 2000.

CCF (Collaborative Computing Frameworks) - A suite of software systems, communications protocols, and tools that enable collaborative work for natural sciences research, collaboratories
Meta Description: [ Intro to CCF site ]
Citadel/UX - BBS, interactive community, groupware
Meta Description: [ Citadel: all-in-one open source groupware. Easy to install, easy to use, easy to live with. ]
Collaborative Virtual Workspace - A collaboration software environment that provides a virtual building where teams can communicate, collaborate, and share information, regardless of their geographic location.
Meta Description: [ CVW is a collaboration software environment
that provides a "virtual building" where teams can communicate,
collaborate, and share information, regardless of their geographic
location. CVW takes virtual meetings one step further and enables virtual
co-location through persistent virtual r... ]
NCSA Habanero - framework designed to give developers the tools they need to create collaborative Java applications. The framework provides the necessary methods that make it possible to create or transition existing applications and applets into collaborative applications.
OrgSite: Ensinger Systems - Free downloadable ASP based Multi-User / Multi-Author software.
Meta Description: [ Providing free software to all types of Organizations who can use a Do It Yourself website that is MultiUser and MultiAuthor, No Programming Required ]
Yoga - free software workalike of Lotus Notes
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