My Poser pals are Shade3D and Blender, more rarely these days, Hexagon.  I don't really do much postwork, but if the effect merits, I will use GIMP, Manga Studio, Anime Studio, FotoSketcher, and Picasa3 (yes !).  There are also many very good commercial and free utilities for Poser which I use, too numerous to mention, all good in their own way.  A few of these, just from the top of my head, are PhilC's Poser Toolbox, Dimension3D's various scripts, Netherworks' scripts, and many others. Should be available here in the Renderosity Marketplace, the Freebie section, or in discussion threads in the Forum.

Eternal Hobbyist