Godot reverse engineering tools

Modified source engine (2017) developed by valve and leaked in 2020. Not for commercial purporses

A portable version of LEGO Island (1997)

Barony Open Source Release

Modernizes F.E.A.R. and its expansions with HUD scaling, high-framerate optimizations, controller support, and other quality-of-life enhancements

Source code for Area 51 (2005)

DOOM III/Quake 4/Prey(2006) GLES on Android/Windows/Linux, DOOM 3 BFG/The Dark Mod/RTCW/Quake 1 2 3/GZDOOM/ETW/RealRTCW/OpenJK/SeriousSam/Skin Deep/Quadrilateral Cowboy/Icarus Starship Command Simu…

A backport of PSX Doom to PC

Third party bot for Counter-Strike

ONLINE UPDATES ONLY

A Zandronum 3.0 fork with improved netcode, configurable movement and many small tweaks

This is an open-source reimplementation of Anachronox, built on top of the Quake 2 engine (which funnily enough is the same engine Anachronox was developed upon).

GoldSource engine multiplayer bot

Half-Life Co-op mod

RCbot created by Cheeseh

Software Rendered OpenGL implementation

Delta Particles SDK