http://www.milkshape3d.com/
Not to put anyone off, but unless you're planning on using pre-made, pre-rigged models (such as those found in Poser), it may take you a while to come to grips with the whole process.
I actually tried to use Poser (it has 30 day trial feature) but kind of gave up on it when I figured that I need to learn a whole program just to use one aspect of a 3d art realm and even then I'd work with Poser models, which are very uncanny valleyish to me and look plastic as all hell (unless you really know how to work with them and put them in a render that's better than the one in Poser and many people are not that good).
In the rest of 3d programs, modeling is one set of hell (because you need to get the polygon ordered so they fit the human movement and anatomy, then there's texturing the damn thing and then (for me at least) the hell of all setting bones inside the model.
Poser kind of avoids that part, but it also limits anything you can do. It's kind of similar to DAZ studio products (which are free basically)
Still haven't figured why dbuske needs it for, if it's just to extract animation for walk cycles then I guess Poser can be great and you can draw over the rendered sprites.
