I am using CCBTools to get a client setup with an affiliate program. There are many options out there and after researching all of them, I decided that CCBTools would be best.
Their script is amazing and has all of the tools that an affiliate program would desire and more. Their staff is friendly, works quickly and is always there to give a helping hand.
If you want a solid affiliate program script that effortlessly interfaces with CCBill and you want a solid company behind it, there is no other choice than CCBTools.