Half-Life: Induction

Azure Sheep is a story mod for Half-Life where the player takes on the role of security guard Barney Calhoun. Unlike the original, his main goal is to rescue his scientist girlfriend Kate from the Black Mesa complex. The mod adds a new campaign with unique maps, enemies, and scenes, and is closely intertwined with the events of the original game.

Diablo: The Hell 4 is the fourth entry in the The Hell mod series – a complete overhaul of the original Diablo. It features additional fixes, new content, new features, new game modes, and new classes.

Half-Life: Savior Complex is a small old-school mod consisting of five maps, where you play as a scientist who finds himself in the Xen world after the resonance cascade and tries to return back to Earth, but returns to the troubled Black Mesa.

Half-Life: Dreamcast — a PC port of the unreleased Half-Life version for the Sega Dreamcast console. This version differs from the original and the later PlayStation 2 adaptation: it features modified levels, unique NPCs and objects not found in other editions, altered difficulty levels, and numerous hidden references to Dreamcast.

A mod that randomizes almost everything in Half-Life, making each playthrough unique. Instead of the familiar crowbar, you might get a Hivehand, and a harmless headcrab could become a deadly enemy. Anything is possible - no matter how many times you return, you'll never predict what's around the corner.