mGSTEP port of the Cube game engine
Improved version of the X-Ray Engine, the game engine
An open source re-implementation of Diablo 2
Data-oriented and data-driven game engine written in Rust
RPG dice roll simulator for vintage Tandy TRS-80 100/102/200 laptops
A 2D game engine and level editor
2D Game Engine with Lua Scripting made on top of SFML
A cross platform Lua based game engine
3D playground built on three.js and cannon.js
KlayGE is a cross-platform open source game engine
Cross-platform 2D and 3D game engine
Android OpenGL Game Engine
IGS Labs
A cross-platform 2D game engine
Opensource Game Studio
Clojure in Unity
A fast, scalable, distributed game server engine/framework for C++
Planimeter Game Engine 2D - LÖVE-based game engine for Lua
Free and Open Game Programming Language for Windows and GNU/Linux
Low-Level Game Engine for Retro Platforms
Blueshift is a cross-platform 3D game engine implemented in C++
Real-time RPG for PC/tablet/phone; multiple quests and random dungeons
Portable game engine with main focus on point-and-click adventures