Halo: Combat Evolved Mod Tools
From Halopedia, the Halo wiki
The Halo CE: Mod Tools program is an editing software released by 343 Industries for the Halo: The Master Chief Collection edition of Halo: Combat Evolved. The modding software itself is quite similar to the Halo Editing Kit released by Gearbox Software for Halo Custom Edition, although with several improvements.
Mapping programs
Much like Halo Custom Edition, Halo CE: Mod Tools comes with three programs designed to assist users in making custom content.