The Open Toolkit library is a fast, low-level C# wrapper for OpenGL
LayaAir is an open-source 2D/3D engine
A simple math library for games and computer graphics
Haskell game engine library for roguelike dungeon crawlers
Vivid3D is an open-source 3D engine with powerful 2D UI.
SDL based generic 2D game engine
Vivid is a modern C++ 3D engine using OpenGL4+
Data-oriented and data-driven game engine written in Rust
Mahasona engine is an open source game engine.
TurboSphere is an easy to learn and powerful JS based game engine.
A complete 2D Game Engine with built in drag and drop editor
A 2D Java game engine