A new Minecraft world editor and converter
Pokémon Save File Editor
Open game and rendering engine packed into a JavaScript framework
Injectable LUA scripting system, SDK generator, live property editor
Flexible level editor
Fast and lightweight JavaScript game engine built on WebGL and glTF
Magic Another Game Engine
The Tiny JavaScript Game Engine That Can!
The flexible game engine
The source code to VVVVVV
A sharp, readable, vector-y version of Monocraft
Cross-platform, open source, and super fast MUD client with scripting
A fresh & lightweight javascript game engine
Ct.js is a desktop game engine that makes learning programming fun
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
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
Java application for creating Morphing videos
Play mechanical keyboard sounds, typewriter sound as you type
This is a Units Editor for Empire At War which will make things easy.
Colonize the New World.
A very richly featured implementation of the Sokoban puzzle game