ClayTek is a 3D games library based on SDL and OpenGL. It is being developed simultaneously with an Editor that uses FLTK, and is being developed under linux (Slack 9.0).
This is a webcomic reader that connects to a webcomic of your choice (dynamically extensible via regex-based plugins) and displays or updates strips. The current version is based on SDL and written in the D programming language.
SIGE - Simple Imperative Game Engine SIGE is a toolkit for game creation with OpenGL. At the moment suport for menus, textures, keybindings and configuration files is working. The project plans to include audio and video at a later time.
Nebelwasser is a mainly platform independent MMORPG Game (Now based on Sauerbraten).
Simple renderer of complex functions including recursive
This program draws a user-defined function from complex plane to RGBA color. Currently, compiled program draws Mandelbrot set, but if you want to draw another function, you need to inherit it from 'Renderer' class in sources, pass it to 'Window' and recompile project. Including 4 versions. The first one was written with C++ and uses CPU 128-bit double. The second does the same, but was written with D language and Derelict3. The third uses GPU (GLSL shaders) to draw Mandelbrot set. It is extremely fast, but uses only 32-bit float. And finally, the fourth works on CPU, but uses arbitrary precision (OpenMP), so it hasn't limit for depth (except rendering time).