The flexible game engine
Ct.js is a desktop game engine that makes learning programming fun
Cross-platform, open source, and super fast MUD client with scripting
An elegant Go board and SGF editor for a more civilized age
This is a Units Editor for Empire At War which will make things easy.
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
LDraw™ editor for LEGO® style digital building instructions.
Advanced map editor
Solitaire-RPG Editor with Support for Game Master Emulation
Solve Go problems (based on GoGrinder GoGrinder.sf.net )
Random generators for tabletop RPG games (D&D, Pathfinder, D20, etc)
Built to be ease of use, with no programming knowledge, Multi-platform
A visual editing environment for Sims3 JAZZ resources.
A tool for roleplaying gamemasters