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
Ze Text Adventure game Builder : Create as you play !
Visual Basic 6 2D online adventure game engine
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
The world is no longer the same
Tools and Z80 engine for creating adventure games. (RUST)