
.map Editors:
-QuArK
Everyone knows QuArK. I'm mentioning it first since I use it to place entities and stuff in my maps. [url]quark.planetquake.gamespy.com/[/url]
-Torque Constructor
Just released today, it lets you save .map files and it has a free license even if you don't own torque. You texture and make your map, though I don't think you can place entities for quakebased games. You might though... And it is a EXTREMLY powerful map editor. VERY easy to use try it out!
http://www.garagegames.com/products/torque/constructor/
-Blender with .map exporter
Alright, this isn't reaally a map editor, but artists will love this. With the camera since you can do flythrough mode (Go into camera view, [Num 0] fly into a box, split your viewports, turn on snap to grid) it's actually really nice for strange geometry. As to how it's performance is I'm not sure, but it's definitly worth using for maps that can't be made with funky brushwork. http://www.quake3bits.com/htm/tutorials/blender_modelling_maps.htm will help a little, but the proper .map exporter that can be used to import maps into QuArK or Radiant can be found at http://www.dragonheadstudio.com/down/map_export.py Supports portals, textures, and lights.
Yep, only 3... If there's more tell me. Ciao..