Pokémon Save File Editor
Injectable LUA scripting system, SDK generator, live property editor
The source code to VVVVVV
Flexible level editor
The flexible game engine
Lightweight console for Minecraft chat and automated scripts
RPG Maker 2000/2003 and EasyRPG games interpreter
An open source flight dynamics & control software library
Cross-platform, open source, and super fast MUD client with scripting
2D game development library for Ruby and C++
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
Ct.js is a desktop game engine that makes learning programming fun
Galgame's Multilingual Real-time Machine Translation Tool
A .NET ascii/ansi console engine written in C# for MonoGame and XNA
A game framework written with osu! in mind.
A dead simple 2D game library for Go
A cross-platform, open-source, pure C game engine for mobile game
An elegant Go board and SGF editor for a more civilized age
Eureka is a DOOM map editor
This is a Units Editor for Empire At War which will make things easy.
An award-winning drawing program for children of all ages
A very efficient tutor.
Chess Database and PGN viewer