Halo Combat Evolved
This is an all in one pack with all the applications you will need to mod halo. The pack includes BSP remover, gmax, Halo CE spy, HHT, HMMM, HMS, HMT, Sential, Spark Edit, Terraedit, ToolRunner, Hex Workshop and plug-ins for HMT.
Here we have the second version of dammahom59's mod installer. It simplifies the task of installing modded maps for Halo PC.
This pack has utilities that further enhances Halo CE.