Flexible level editor
The Tiny JavaScript Game Engine That Can!
Java application for creating Morphing videos
Edit BZFlag world maps with 3D preview
This is a Units Editor for Empire At War which will make things easy.
GPS track editor for editing tracks and planning (multiple) day tours
Custom Map File Generator for C-evo
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
LDraw™ editor for LEGO® style digital building instructions.
A sharp, readable, vector-y version of Monocraft
An elegant Go board and SGF editor for a more civilized age
Searching in 3D stages
PAK file editor for Quake engine games
Open RealStrategyGameLibrary (Engine)
Solve Go problems (based on GoGrinder GoGrinder.sf.net )
A Smarter Way to Tag FLAC, Vorbis, Lyrics, WMA, WavPack, and ID3 Tags
A suite of tools for any RPG system
A fantasy RPG.
Tools using the s3pi library and other related works
A JavaScript game library to quickly develop board games for the web