www.qeradiant.com Go here to get the map editor and BSP compiler tools. You may need to have Quake 3 installed as the editor needs some textures but i may be wrong. If in doubt, download the Quake 3 arena demo ~100mb and install it. That should give you pretty much all the tools you need, oh and get "Wally" http://www.telefragged.com/wally/ a free texture package that allows you to add your own textures to the map editor.
Blooming BSP!!
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