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