Underground cavern battle scene in Lionheart 1993 classic game

Half-Life: Extended is a large mod for Half-Life that expands the original campaign by combining content from Blue Shift and Opposing Force, adding new levels, reworking NPCs and maps, and increasing world detail. The campaign has become larger and more varied, making Half-Life: Extended feel like an almost entirely new game.

A brand-new difficulty created based on the Ultra Nightmare difficulty and ported for the Doom 64: Unseen Evil! mod.

Half-Life: The Infected is a mod that adds a new 28-map campaign for Half-Life. In it, you play as an electrical intern named Gerald Backman, who finds himself at the epicenter of a resonance cascade and faces horrors from the Xen world, as well as the sinister Race X.

Halo: GoldSource is a mod for Half-Life that recreates the atmosphere and gameplay style of Halo, including Slayer and Firefight modes, iconic weapons and maps from the original shooter, but runs on the GoldSrc engine.

Tiberian Sun Factions is a mod for C&C Tiberian Sun that primarily adds two new factions to the game - Civilian Defense Force (CDF) and Computer Assisted Biologically Augmented Lifeform (CABAL).