PSPy is a content manager for the Sony PSP. You will have acces to your homebrews, games backup, savegames, videos and music. Written in Python for Unix systems, using Glade/pyGTK, under the GPL license.
AFX is an X11-based, extensible, graphical, and highly configurable frontend primarily for use on tv-connected systems. The original design goal is a joystick-controlled frontend for an entertainment (games, emulators, audio, and video) box.
A simple, yet powerful framework built around the OGRE rendering system. Has many features in the works such as AI, Audio, an entity system (much like CEL), and a complete level editor.
Multisetup is a networking application server that provides a multiple os, thin (multimedia) client based, legacy device friendly environment for home networks. Its an alternative to single OS networks and XP Media Center.
SpaceQuark is a complete game engine for Windows. It takes care of almost all aspects of games such as 3D-Graphics Rendering (using OGRE), Audio(using FMOD), Physics, Game Logic and Artificial Intelligence, Multiplayer, Plugins, Scripting and much more.
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Orange 3D, a game engine distributed under the zlib/libpng license, is an all in one solution, with IDE, level editor, 2d painter, 3d modeler, and possibly audio editing software all in one clean package, for free!