3D and 2D game engine written in Rust
Voxel game-creation platform with easy modding and game creation
An OpenGL RTS game engine written in C
Game engine supporting many 3D/2D formats and graphic effects
Vivid is a modern C++ 3D engine using OpenGL4+
Blueshift is a cross-platform 3D game engine implemented in C++
Mahasona engine is an open source game engine.