Some of those arent "human creators" though....

Absolute Character Tools (cgcharacter)
cg Character (cgcharacter)
cg Skin (cgcharacter)
Character Studio (autodesk)
Kaydara's Human IK

are rigging solutions, they dont create any geometry and you can use them for anything, not just humans.

Mirai (izware)

is a modeller, one of the first box modelling apps, now sadly defunct.

Also there is a bunch of more stuff that goes into creating virtual humans. Various skin shaders, texturing apps, hair systems, cloth systems, rendering systems and modellers are all used to simulate human appearence, musculature and motion. And a compositor like shake, AE or fusion to combine all this together to a final work.