Just a quick google search and I'm finding all sorts of similar sites, it looks like this is becoming a crowded field . . . but HeroForge is the category originator (to my knowledge) and the most well known.
There also seem to be a lot of studios/artists that work on commission, rather than having a 3D character builder the user can customize. Lots, lots of options.
I get a kick out of how wonderfully over the top and DARK Manganiello's game is. It makes perfect sense when you match the characters of his home game to his nerd fashion line, "Death Saves" a blend of D&D and death metal sensibilities.
But I'm also done purchasing mini's with mediocre to poor paint jobs and bendy weapons, which WizKids haven't managed to avoid in their pre-painted line as of yet, even with their "premium figures". I'm not really criticizing, as higher quality materials and paint jobs would make the prices out-of-reach for most of us . . . it's just not an area I'm interested in anymore.
Now, if WizKids releases versions of these guys in their Deep Cuts (unpainted) line . . . I might go for that!!