Halo Zero Level Editor
From Halopedia, the Halo wiki
Summary
The current version of the Halo Zero Editor is 1.0.1 and has been available since 2006, and will probably not be updated anymore.
The current version of the level editor is quite unstable and you have to back the levels up quite often.
Mods
The Level Editor allows players, mainly the members of the Halo Zero Community, to mod maps.
