Pokémon Save File Editor
Desktop/Android/HTML5/iOS Java game development framework
Plugin for IntelliJ IDEA that gives special support for Minecraft mods
Retro video game emulation for macOS
Custom launcher for Minecraft to easily manage installations
Magic Another Game Engine
Custom launcher to manage multiple installations of Minecraft at once
Open game and rendering engine packed into a JavaScript framework
Fast and lightweight JavaScript game engine built on WebGL and glTF
Fast PlayStation 1 emulator for x86-64/AArch32/AArch64
The source code to VVVVVV
Flexible level editor
An elegant Go board and SGF editor for a more civilized age
Injectable LUA scripting system, SDK generator, live property editor
Ct.js is a desktop game engine that makes learning programming fun
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
The Tiny JavaScript Game Engine That Can!
Eva.js is a front-end game engine for creating interactive projects
Java/JavaFX/Kotlin Game Library (Engine)
A game framework written with osu! in mind.
The solution that allows unity games update in runtime
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
Cross-platform, open source, and super fast MUD client with scripting
A cross-platform, open-source, pure C game engine for mobile game
The flexible game engine