Multi Theft Auto is a game engine
Free, open source game engine online
A game framework written with osu! in mind.
scene-oriented, flexible 3D engine (C++, Python, C#, Java)
GemRB is a portable open-source implementation of the Infinity Engine
Orx: Portable Game Engine
Game engine supporting many 3D/2D formats and graphic effects
FiveM is a modification for Grand Theft Auto V
A Editor for Minecraft NBT files
A promising chess program
Delphi Java - VRCalc++ OOSL (Script) and + (Binary Exec Distro)
A surrealist narrative-driven walking simulator
A game engine for console based text games
Vivid3D is an open-source 3D engine with powerful 2D UI.
One of the First Blooket hacks online
Blind Chess using Taiwan rule
Spring is a free RTS engine developed for Windows, Linux and Mac OS X.
Data-oriented and data-driven game engine written in Rust
Steer in GTBikeV with any unsupported joystick
Modern 3D engine and IDE written using C# and C++.
KlayGE is a cross-platform open source game engine
Automatic price checking script for Path of Exile
Character animation system for games and simulations.