One framework for creating powerful cross-platform games
Fast and lightweight JavaScript game engine built on WebGL and glTF
3D Procedural Game Engine Using OpenGL
Open 3D Engine (O3DE) is an Apache 2.0-licensed multi-platform 3D
A modern, cross-platform Quake game engine based on FitzQuake.
LDraw™ editor for LEGO® style digital building instructions.
An isometric arcade-style game of skill, puzzles and exploration
Cross-platform real-time strategy game (3D)
Planimeter Game Engine 2D - LÖVE-based game engine for Lua
A planetarium software that shows a 3D simulation of the night sky
Portal Adventure - The hunt for Dr. Freak
Open source first/third person shooter set in real world locations
open game world to be set in a realistic environment
Azmyth Game Framework
SuperWikia: The Runtime/Realtime Environment for Codesmiths
Open source, moddable game engine for the "Polygon Love 2" game
Cube2:Sauerbraten Mod with various features