The Free Software Foundation (GNU).
The CVS project, which is our backend data storage. We recommend jCVS for a frontend. In the future we plan to move our repositories to Subversion.
Site dedicated to development of free/open source engineering software tools.
OpenCores is bringing open source to chip design.
Open designed headheld computer.
Open source CAD: QCad, LignumCAD, and Free-CAD
Open source modeling kernel: OpenCascade
Open source analysis: OpenOffice.org, Gnumeric, Scientific Tools for Python (SciPy), Octave, SciLab, and Euler.