invitebox.comSoftware by InviteBox
Girafi - Get more from your website visitors. Referrals, feedback, e-mails & more.
Viral Loops - Viral Loops is a viral and referral marketing platform to launch ranking competitions, sweepstakes, pre-launch and referral programs.
iRefers - iRefers is the biggest and world's leading affiliate network.
Referral Candy - Run a fully automated, customizable and easy to integrate referral program for ecommerce.
Commission Junction - CJ Affiliate by Conversant (formerly Commission Junction)
Firewards - Setup a referral and rewards program for your email list or newsletter.