IRecommended Map Editing Tools

Forge Updater
Fixes several bugs in Forge

Hex 1.0.4
Terminal script editor; easier than writing scripts by hand

Marathon Map Splitter 1.0.7
Unmerge merged maps so they can be edited.

Chisel 2.1.6
Does everything to a map that Forge can't do.

ResEdit 2.1.3
Create your PICT resources file

IMap Editing Tutorials

Hastur's Workshop
Sophisticated mapmaking techniques brought to you by Double Aught, the creators of the brilliant maps found in Marathon Infinity.

Jason Harper's Tutorials
Amazing discoveries by the winner of Bungie's mapmaking competition.

The Elements of Mapmaking Style
A guide to mapmaking aesthetics in DocMaker format.

More Textures
Did you know that you can increase a level's texture count from under 40 to over 100?
IAdditional Tools
I

World Unit to Basic Unit Converter Mac Version | Windows Version
Easily convert Forge's World Units into Anvil/Pfhorge Basic Units. This might come in handy for pfhorge users.