Solar2D Game Engine main repository (ex Corona SDK)
Open source voxel game engine with support for survival and crafting
Godot is a powerful cross-platform game engine
Open source HTML5 game framework that offers WebGL and Canvas
Desktop/Android/HTML5/iOS Java game development framework
The game engine for everyone
Voxel game-creation platform with easy modding and game creation
Open source cross-platform multi-purpose game toolkit
RetroArch is a frontend for emulators, game engines and media players.
A cross-platform PSP emulator
Xash3D FWGS engine
One framework for creating powerful cross-platform games
Sandbox video game with a powerful physics engine
A certain block game
The source code to VVVVVV
Free, cross-platform 2D game engine powered by Haxe and OpenFL
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Open-source Android/Desktop remake of Civ V
Cross-platform game engine in Rust
Java/JavaFX/Kotlin Game Library (Engine)
New Godot bindings for Swift
Satisfying monster shooter
A dead simple 2D game engine for Go
Stream switch games to your PC via USB or network
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs