Else for not too very height number of polygons there is SketchuUp Make (free)
+ Vertex Tools + SubD + QuadFace Tools (free) + tones of free plugins for anythings! :)
https://www.sketchup.com/products/sketchup-make free
http://evilsoftwareempire.com/vertex-tools/ 20$
http://evilsoftwareempire.com/subd 40$

By 600v aka xlrlxi (a Sketchup Master) http://600v.deviantart.com/gallery/ (30 pages of crazzy models : retro cars, design, SF buildings, etc...)