Flexible level editor
Eureka is a DOOM map editor
Java application for creating Morphing videos
Descent 3 by Outrage Entertainment
Cross-platform, open source, and super fast MUD client with scripting
An OpenGL RTS game engine written in C
Edit diagram.sty LaTeX diagrams
Final Fantasy VIII Save Editor
Final Fantasy VII field archive editor
Retro style, multi-platform soccer game
A Editor for Minecraft NBT files
3D racing game with Sci-Fi elements and Track Editor
A planetarium software that shows a 3D simulation of the night sky
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
Final Fantasy VIII field archive editor
Domination is a game that is a bit like the board game Risk
Colonize the New World.
GPS track editor for editing tracks and planning (multiple) day tours
A 2D scrolling platform shooter, inspired by Duke Nukem 1
SDL based generic 2D game engine