Free Lance?
The company I work for provides casino software to the majority of per-per-head and credit shops in Costa Rica. It's ideally suited for PPH because it's licensed on a flat monthly fee instead of a % of revenue, and it can be integrated seamlessly -- single-account, single-wallet -- with ASI, DGS, INET, or any other sportsbook system (even those developed in-house).
DGS actively resells our casino, and we can work with other software vendors. So whether you're running a PPH book or marketing PPH software to books, you should check it out.
I'll send you a demo link if you send me your email. I don't post my work address here to avoid spam.