The Phoenix Project has created Halo Goldsource, putting Halo's multiplayer into the Half-Life engine.
The mod includes Halo's slayer and firefight modes, a variety of Halo's weapons, remade maps, and original arenas.
New features in the 1.0 version include native Linux support, controller support, improved shield generation, and HD sound design.
While the mod is impressive in capturing Halo's essence, it lacks Halo's unique movement mechanics and vehicles, which are key components of Halo's multiplayer experience.