Wiko, the wiki compiler, compiles wiki like files into html and LaTeX, combining easy wiki syntax, your preferred non-web text editor and svn/cvs control to write static webs, cientific articles or even blogs.
Mob2D is a 2D rendering engine designed from the ground up to provide simplicity above all else while still being robust and flexible. You could make a 2D game with this engine with only relatively little knowledge of OpenGL.
The Beholder project was begun with the purpose of creating an open source code library for use in cross-platform development of game software based on the D20 Game License released under the OGL by Wizards of the Coast.
SleekIce is an easy to use game engine used to write games in Java. This will allow a game programmers to devote more time and thought to their game content rather than how to make the game work.