A modular Common Lisp game engine
Multi-platform Engine for Desktop, XBOX (UWP) and Mobile games
Cross-platform 2D and 3D game engine with modular architecture
3D and 2D game engine written in Rust
Vivid3D is an open-source 3D engine with powerful 2D UI.
Vivid is a modern C++ 3D engine using OpenGL4+
Go 3D Game Engine
Modern 3D engine and IDE written using C# and C++.
Vivid Engine 2 is an open source 3D Engine coded using C# and C++.
Source code of the chapters of the book 3D Game Development with LWJGL
Mahasona engine is an open source game engine.
Cross platform 2D/3D game engine written in C++11 & OpenGL ES 2/3
Multimedia asset management and manipulator for Étoilé
2D - 3D game engine