Post Affiliate Pro plugin by jurajsim integrates Post Affiliate Pro software into any WordPress installation.
Post Affiliate Pro runs your 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. Post Affiliate Pro will automate your entire affiliate program. It is a great tool to recruit and manage your affiliates. Each affiliate will be given a selection of marketing and promotional tools to promote your business. Also, it will track your affiliate’s referrals, commissions, record payouts, and much more.
More info: http://www.qualityunit.com/postaffiliatepro/