Halo: Combat Evolved Mod Tools
From Halopedia, the Halo wiki
The Halo: Combat Evolved Modding Tools, abbreviated as Halo: CE Modding Tools or H1A Editing Kit, is an editing software released by 343 Industries for the Master Chief Collection version of Halo: Combat Evolved and distributed via Steam. The modding software itself is quite similar to the Halo Editing Kit released by Gearbox Software for Halo Custom Edition, although with several improvements, and an additional program called H1A standalone build for loading tags instead of maps. H1A-EK includes updates to the game engine and tools, bug fixes QoL improvements, extended limits, and new features. A complete source tag set for the game's stock campaign and multiplayer maps, plus source scripts for the campaign is also available.
The Halo: CE Mod Tools are a free download for all players via Steam, regardless of if they own The Master Chief Collection or not. The tools can be found in the "Tools" section of the Steam Library, or installed by clicking the link provided in this post.
Much like Halo Custom Edition, H1a Editing Kit comes with several programs designed to assist users in making custom content.
Tool is a command line program for compiling tags and maps.
Guerilla is a program that allows users to edit tags. Tags house game data and their values such as weapons, vehicles, models, and textures. These tags are called upon in game to spawn objects.
Sapien is a program that creates a visual representation of the game world for users to make physical edits to such as creating NPCS, vehicles, and cameras.
H1A Standalone Build
H1A Standalone Build is an executable that runs a modified version of Halo: Custom Edition. The main difference being that H1A Standalone Build does not load maps, but individual tags. This negates the need for compiling, allowing for quicker iteration and editing.
Changes from the Halo Editing Kit