s2Member® ( Membership w/ PayPal® )
The s2Member® Framework (free) integrates with PayPal® Website Payments Standard (also free), and fully supports recurring billing. s2Member supports custom Pages for registration (including Custom Registration/Profile Fields), account access, and a lot more. s2Member is compatible with Multisite Networking too, and even with BuddyPress and bbPress. With the s2Member® Pro add-on (an optional paid upgrade), you can add support for unlimited Membership Levels, PayPal® Website Payments Pro (w/ Pro Forms to facilitate on-site credit card processing), Authorize.Net® (also with Pro Forms), Google® Checkout, ClickBank®, advanced User Import/Export tools, the ability to use Coupon Codes, and many other enhancements. Videos available at: s2Member.com / Videos. s2Member supports Free Subscribers (at Level #0), and up to four primary Membership Levels [1-4] (unlimited with s2Member® Pro). You can label your Membership Levels anything you like. You can learn more about s2Member® at s2Member.com.