Zepir just released his cool updated World Editor. Yes the only REAL 3rd party World Editor for War3. Fetch version 9.1 here: http://www.wc3sear.ch/?p=Tools&ID=12
BTW: this map editor has not been designed to "replace" the WE. Use it as an additionnal tool that allows you to do stuff you can't do with the WE (path editing, change water level, tiles flags, number of tilesets, protection, hudge ground level differences, doodads in shapes, map convertions,...)