Open-source engine for Heroes of Might and Magic III
Solar2D Game Engine main repository (ex Corona SDK)
Urho3D Game engine
New Godot bindings for Swift
Embeddable unity game engine view for Flutter
KorGE Game Engine. Multiplatform Kotlin Game Engine & Korlibs
A cross-platform, open-source, pure C game engine for mobile game
Game engine supporting many 3D/2D formats and graphic effects
A cross-platform 2D game engine
Cross-platform 2D and 3D game engine
Free and Open Game Programming Language for Windows and GNU/Linux
Blueshift is a cross-platform 3D game engine implemented in C++
Portable game engine with main focus on point-and-click adventures
online 4X browser game engine
Visual Novel engine, editor and game development.