Ok, in no particular order....
Old Crow Models makes a nice 25mm scifi line as well as a line of "Hammer's Slammers" vehicles
http://www.oldcrowmodels.co.uk/DLD Productions makes (made) some great stuff, but I am unsure they are still in production.
http://www.dldproductions.com/index1.htmlPig Iron Productions makes some interesting vehicles.
http://www.pig-iron-productions.com/Armorcast makes a couple.
http://www.armorcast.com/Scotia Grendel has a few in their Grendel line, Void 1.1 line, and a few in their Kryomek line under the Nexus Forces.
http://www.scotiagrendel.com/index.htmlThese are the one's I can think of off the top of my head.
Daniel
PS: There is Games Workshop of course.
