Here you can download tools for Egoboo editing. These are all freeware. If I have missed any tools, let me know and I will add them.
Quake 2 Modeler - The simple, stock program that is primarily used for model creation with Egoboo. It is freeware.
Aztec - Another freeware program. Aztec has a few more features than the Quake 2 Modeler, but it is also still in development.
NPherno's Skin Tool - Useful for drawing skins on your model and simple touch up work. Use in combination with your favorite paint program.
Cartman - Fully functional level editor designed for Egoboo. It's a little bit difficult to work with, but it's what we've got.
EgoMap - The latest effort by Arakon. EgoMap is looking to be a great level editor. It's still a work in progress, but includes many functions that Cartman doesn't. An example would be the random level generator and the 3d view.
Mazeman - Work in progress. Not much functionality at this point in time.
Wally - Paint program designed specifically for drawing and editing tileable textures.