Halo Mapping Tools
Download: File:HMT.zip - Note: Use the file called "HMT" in order to use version 0.7.5 (latest).
Version: 0.5 and 0.7.5
Requirements: Demo Hack, if modding Halo Demo maps
Trivia: Bob used to publish his programs under the label Scotiasoft which can be found in the get info of several of his programs.
The Halo Mapping Tools (HMT) application is similar to Eschaton (listed above), but is primarily valued for its metadata handling and simple BSP editing capabilities. The experienced modder will probably tell you to use Eschaton instead of HMT, and then only use HMT for metadata and certain other jobs. It was written in REALBasic, and is based off of MonoxideC's code for HMTv3.1 for PC.