Godot is a powerful cross-platform game engine
Open source voxel game engine with support for survival and crafting
The game engine for everyone
Solar2D Game Engine main repository (ex Corona SDK)
A cross-platform, open-source, pure C game engine for mobile game
Urho3D Game engine
Open-source engine for Heroes of Might and Magic III
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
New Godot bindings for Swift
Embeddable unity game engine view for Flutter
Kotlin extensions for the libGDX game framework
Engo is an open-source 2D game engine written in Go
Open source reimplementation of GTA San Andreas game engine in Unity
GemRB is a portable open-source implementation of the Infinity Engine
Cross-platform 2D game engine (+ full OpenGL, +full OpenGL ES )
Orx: Portable Game Engine
Game engine supporting many 3D/2D formats and graphic effects
Game engine to build text adventures.
Open source reimplementation of GTA San Andreas game engine in Unity
2D Game Engine
A cross-platform 2D game engine
Cross-platform 2D and 3D game engine
Android OpenGL Game Engine
Free and Open Game Programming Language for Windows and GNU/Linux