Some more options:
-MagicPoser: free app for iPhone and Android, lets you pose a mannequin, add props and change the lighting. The free version is a bit limited, but if you're just looking to pose human mannequins, it can work just fine 
a bit fiddly for my taste, but very nice to have at your disposal, especially if you're not at home!
-Daz Studio (software): I haven't used this one in AGES, so forgive me if anything has changed in the meantime, but from what I can remember, the software is free and some mannequins/props are also available for free. Used for 3D comics and illustrations, but I've seen people using it also to create 3D references. Case in point: kingcholera.
-Metahuman: lets you create incredibly realistic characters. The poses available are limited, but I think it's a great tool to figure out how lighting works on a face
-Blender: you can import a rigged 3D mannequin and pose it. Personally, I use The Sims 3 mannequins, as they're fairly easy to use and rigs are very similar to CSP ones (plus, I can import the poses in game and set up my scenes there 
). Here's a tutorial for making TS3 poses and here's one for Sims 4 poses.
