The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
Embeddable unity game engine view for Flutter
Game engine supporting many 3D/2D formats and graphic effects
The multiplayer game engine
Engo is an open-source 2D game engine written in Go
Retro game engine for creating games like it's 1997
A hand-crafted 2D game library in Go
Go 3D Game Engine