First I gotta say that after seeing that dancing person in your signature I couldn't stop laughing for ten minutes.
Anywho, there are other world editors, but they cost money. Cartography Shop and Geoscape3d are good. There is of course, Google.
One last free level editor is only a terrain editor, but is very awesome. Check out
http://www.robinking.com/allseeingi and donwload Total Terrain. You'll need a heightmap reader, though.
Crazy Donut Productions, Current Project: KillZone
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