datafeedr is described as 'Datafeedr makes it easy to build and embed an affiliate store into your WordPress blog. No programming required. Promote products from thousands of merchants. Your store automatically updates. Choose from 270+ million products to build your store'. There are more than 25 alternatives to datafeedr for a variety of platforms, including Online / Web-based, Self-Hosted solutions, SaaS, Wordpress and iPhone. The best alternative is Avangate. It's not free, so if you're looking for a free alternative, you could try Bytemart.org or Commission Junction. Other great apps like datafeedr are ShareASale (Paid), Blink (Paid), ClickBank (Free) and Refersion (Freemium).
With the iTunes affiliate program you can link to media on the iTunes Store, the iOS App Store, the Mac App Store and the iBook Store and earn commissions from purchases made via those links, but creating affiliate links can be time-consuming and fiddly.
Post Affiliate Pro runs an entire affiliate program from top to bottom, with the exception of processing the financial transactions. However, most payment processors and shopping carts can be fully integrated with Post Affiliate Pro.