The source code to VVVVVV
Enables Roblox developers to use professional software tools
Ct.js is a desktop game engine that makes learning programming fun
Flexible level editor
The HTML5 Creation Engine
Cross-platform, open source, and super fast MUD client with scripting
A framework to build Pokémon RPG games
Games for tomorrow's programmers
The flexible game engine
Make Minecraft Java Edition mods, Minecraft Bedrock Edition Add-Ons
An open source flight dynamics & control software library
This is a Units Editor for Empire At War which will make things easy.
Open source library for creative expression on the web, desktop, etc.
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
A planetarium software that shows a 3D simulation of the night sky
GPS track editor for editing tracks and planning (multiple) day tours
Remake of BOULDER DASH with NCurses
A cross-platform port of Hexen II game.
Full featured MUD server with all the trimmings.
LDraw™ editor for LEGO® style digital building instructions.
realistic driving simulation + functions for 2D/3D graphics
A game engine for console based text games
An elegant Go board and SGF editor for a more civilized age
Advanced map editor