Desktop/Android/HTML5/iOS Java game development framework
Satisfying monster shooter
The source code to VVVVVV
Java/JavaFX/Kotlin Game Library (Engine)
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
Open source HTML5 game framework that offers WebGL and Canvas
Open-source engine for Heroes of Might and Magic III
UCI chess engine
The game engine for everyone
An open source reimplementation of the Among Us Server
Solar2D Game Engine main repository (ex Corona SDK)
Netcode that provides networking capabilities to GameObject workflows
Cross-Platform C++ 2D/3D game engine
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Home theater software and entertainment hub for digital media
Cross-platform game engine in Rust
One framework for creating powerful cross-platform games
Accuracy-focused XNA4 reimplementation for open platforms
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Kotlin extensions for the libGDX game framework
A completely free, open-source, 2D game engine
Action-adventure game originally released in 2013
Gideros Release version
A MUD client for Android, iOS, Linux, Mac OS X and Windows