Open source simulation game based on Transport Tycoon Deluxe
A lightweight online game framework
lua dev plugin for unreal engine 4 or 5
3D game engine/framework in C, with Luajit and Python bindings now
Gideros Release version
A lightweight game server framework implemented with Actor Model
A dead simple 2D game library for Go
An award-winning drawing program for children of all ages
FlightGear Flight Simulator: free open-source multiplatform flight sim
RTS game with the theme of Strategy by Design
A free transportation simulator game
A strategy game with a high fantasy theme
A very efficient tutor.
Chess Database and Toolkit program
Chess Database and PGN viewer
For exploring cellular automata like Conway's Game of Life.
A standalone UQM mod made to enhance gameplay and visuals
A modern, cross-platform Quake game engine based on FitzQuake.
Good-looking and addictive OpenSource games