fheroes2 is a recreation of Heroes of Might and Magic II game engine
The HTML5 Creation Engine
Python MUD/MUX/MUSH/MU* development system
3D Procedural Game Engine Using OpenGL
A pure Go game engine
Open source library for creative expression on the web, desktop, etc.
3D and 2D game engine written in Rust
GemRB is a portable open-source implementation of the Infinity Engine
A tool to easily transform Unreal Engine games into VR experiences
Cross-platform 2D game engine (+ full OpenGL, +full OpenGL ES )
Game engine supporting many 3D/2D formats and graphic effects
Old-school 2D game engine
An isometric arcade-style game of skill, puzzles and exploration
Visual Basic 6 2D online adventure game engine
Ze Text Adventure game Builder : Create as you play !
Game/Scene Development System
A Complete WebGPU Game Engine for Browser & Desktop Arcade Oriented
ZDoom 2.8.1 fork focusing on modernisation, performance and stability
RTSish Game Engine
The world is no longer the same
Tools and Z80 engine for creating adventure games. (RUST)