AnaLina is a mathematics/physics presentation, visualization and simulation system. It is intended to be used by teachers etc. in classrooms to help in teaching linear algebra and physics (mainly mechanics).
Freeband is a free, cross-platform, open source alternative to the games Guitar Hero and similar games.
Language Tutor is a tool, useful in learning and memorizing new word in a foreign language. It supports up to 6 languages simultaneously, uses flash cards and other exercises or games and may be used as a quiz tool. It works on Palm or Windows.
Mac OS X and Windows OpenGL 3D Engine tools, content and code to create games and applications. Newton physics, OpenAL sound with OGG Vorbis, Lua, Revolution, written in C.
make some free tool to help learning