Greenguy's Board - Any other software/solutions that compete with NATS?

Quote from my partner:

So, i'm in the process of setting up a paysite (which is a helluva lot more work than i though, my hats off to you paysite owners).

I, like most all of those new into this realm of adult, am considering NATS to use for my aff software.

I'd like to be fully educated before i make my decision though, and to do that I need to know what other solutions out there exist.

I know that mpa3 is out there, but using that is like instantly reducing your affiliate base just because of their reputation of shaving. Personally, I'm sure it's either a misunderstanding or they've removed that functionality by now, but regardless the reputation is there and I'd rather not have that hindering the growth of my program.

I've also heard of monolith, but i can't find any docuementation for it online.

And, of course, just the standard ccbill interface.... but i'd really like to have cascading from the get go.

Any others?