This could use a little revival.

Team fortress 2 stuff:
http://developer.valvesoftware.com/w...Level_Creation

Terrain:
http://developer.valvesoftware.com/wiki/Displacement

And some basic shit legionaire dug up

http://developer.valvesoftware.com/wiki/Your_First_Map

http://www.moddb.com/games/half-life...-hammer-editor

And you can find just about anything you else you might need here.

http://developer.valvesoftware.com/wiki/Main_Page

On another note I made a level for tf2 today :awesome: