Non-profit organization dedicated to eliminating restrictions on copying, redistributing, understanding, and modifying computer programs. GNU Project was begun to develop a complete free Unix-like operating system.

Dedicated to managing and promoting the Open Source trademark for the good of the community. Includes a definition of 'Open Source', and a list of approved licenses.

A research program at Harvard Law School founded to explore cyberspace, share in its study, and help pioneer its development.

A non-profit organization which was founded to help organizations develop and distribute open hardware and software.

Contains the Debian Free Software Guidelines, which are regarded as compliance rules for free software by many others besides Debian package maintainers.

European branch of the FSF. Promotes the freedom to use, study, share, and improve software. Supports the development of free software such as the GNU/Linux operating system.

A global effort to promote the use of free and Open Source software. Lists forthcoming events, news, forum, gallery and contributing teams.

Explains the difference between "Free Software" described as a social movement focusing on freedom and "Open Source" described as a development methodology. By Richard Stallman, the founder of the Free Software Foundation.

In-depth review and analysis of the many quantitative reasons to use open source software, with statistics from a variety of recent surveys.

Dedicated to establishing a free market in information technology, by the removal of barriers to competition and working towards sane patent systems and open standards.