Flooded underground facility in Half-Life 1998 mod E7 Black Star

Diablo I HD Mod (Belzebub) is a large-scale mod for the original Diablo that adds HD resolution support, new character classes, restored quests, an improved interface, and numerous gameplay enhancements.

Black Mesa: Classic is an ambitious fan project aimed at porting the Black Mesa remake (on the Source engine) back to the original GoldSrc engine from Half-Life. The mod restores the atmosphere of the original game while adding a number of improvements and maintaining low system requirements.

Stronghold 2 Crusader is a mod that brings Stronghold 2 to the Middle East during the Crusades. Numerous new textures, sounds, and graphics create an impressive atmosphere of the desert and crusaders, and the mod also adds a new Crusader campaign.

Half-Life 1: Ray Traced — A fan remaster of the classic game on the GoldSrc engine with ray tracing support. The mod adds modern global illumination, reflections, and enhanced visual effects while preserving the original Half-Life atmosphere.

Diablo Infernity is a mod for the original Diablo with quality-of-life improvements and a new difficulty level. It is compatible with vanilla characters. After level 30, expanded gameplay with new affixes and progression unlocks, while preserving the classic atmosphere.