A group of modders has rebuilt Halo inside of the Half-Life engine, uniting the two FPS games into a new experience you can play now.

Halo Goldsource brings Slayer and Firefight into Valve's classic shooter.

The Orange Box for free - the iconic collection from Valve: Half-Life 2, Portal, Team Fortress 2. Play on Steam with a free ...

This video collection showcases gameplay footage from the rare Half-Life 1 Alpha 0.52, offering a glimpse into the early development stages of Valve’s iconic first-person shooter. The original ...

This Half-Life mod remakes Valve's classic shooter to be both longer and wider, and it has radically altered my perception of the original; A mod that lets you play Half-Life 2 multiplayer as the ...