The 2013 edition of the Source SDK

OpenMW is an open-source open-world RPG game engine that supports playing Morrowind. Main repo and issue tracker can be found here: https://gitlab.com/OpenMW/openmw/

Cross-platform game hack for Counter-Strike 2 with Panorama-based GUI.

Injectable LUA scripting system, SDK generator, live property editor and other dumping utilities for UE4/5 games

SourceMod - Source Engine Scripting and Administration

Momentum Mod - Standalone Source Movement Speedrunning (READ README)

Disable items_games.txt integrity checks in TF2

SourceMod extension allowing temporary removal of limits on TF2 convar tf_max_voice_speak_delay