Well they need a little improvement as for segments try these
Magic FPS
($15.00)
link-
http://www.uberdroid.com/fastfps/
Features- With Magic FPS 2.2 You can make fully functioning room and ground segments as well as sign, box, cylinder, hills walls, arches, doors, and imported x object entities very quickly without any cumbersome coding or file managing. Now comes with OVER 50 high-quality textures.
Signs IV
($15.00)
Link-
http://www.fpsconline.com/signsiv.asp
Features- Change Textures, Create Scripts and a lot more, Ceilings Added,Fixed Walk-Thru walls,Text Labels now appear in library for all segments,Now create Text with Background Images
Segment Creator
(Freeware)
Link-
http://forum.thegamecreators.com/?m=forum_view&t=71580&b=24
Features- just make segments
I recommend MagicFPS