Multi Theft Auto is a game engine
Xash3D FWGS engine
3D game engine/framework in C, with Luajit and Python bindings now
The game engine for everyone
The HTML5 Creation Engine
A quick and easy to use drag and drop retro game creator
Ct.js is a desktop game engine that makes learning programming fun
Open source library for creative expression on the web, desktop, etc.
Tools and Z80 engine for creating adventure games. (RUST)
Full featured MUD server with all the trimmings.
C++ lightweight cross-platform game engine
Orx: Data-Driven Game Engine
Non-violent educational 2D RPG engine in Java, with a game builder
Ze Text Adventure game Builder : Create as you play !
A cell-based puzzle game featuring classic and completely new puzzles
Svelto ECS C# Entity Component System
Pycraft is an open-source, OpenGL based game made in Python
Vivid3D is an open-source 3D engine with powerful 2D UI.
A game engine for console based text games
Mini game engine for games104
Retro game engine for creating games like it's 1997
Data-oriented and data-driven game engine written in Rust
Low-Level Game Engine for Retro Platforms
OpenSAGE is a free, open source re-implementation of SAGE