Gravit is a gravity simulator. It uses Newtonian physics using the Barnes-Hut N-body algorithm. Although the main goal of Gravit is to be as accurate as possible, it also creates beautiful looking gravity patterns. It records the history of each particle so that it can animate and display a path of its travels. At any stage you can rotate your view in 3D and zoom in and out. Gravit uses OpenGL, Lua, SDL, SDL_ttf, and SDL_image.
pyraknet is a Python extension that has bindings for the reliable UDP network library RakNet. pyraknet allows you to concentrate on your game or application rather then writing a your own networking code. It is straightforward to implement and you only need a small amount of TCP/IP networking knowledge.