s2Member is a WordPress plugin that allows you to create members-only content on your website with an intuitive user interface designed specifically for WordPress. You will be able to restrict access to users depending on the membership level they have by defining multiple payment gateways including Paypal IPN and Authorize.Net. You can create an unlimited number of membership levels and customize each level with its own set of benefits. You will also be able to offer products for individual or bundled purchase, have an internal messaging system and more features.

Users will be able to join your website as a member by going through the front-end sign up process. Once they become a member, they will have access to members-only content behind log in walls depending on the membership level that they purchased.

s2Member used by:

• Coaches who want to add a members-only area to their blogs.
• Business owners who want to add a members-only area to their websites.
• Bloggers who want to monetize their blogs with an online store or magazine style membership site.
• Universities that want to give access to their electronic textbooks
• Marketers that want to sell a paid membership site

It is the most popular membership plugin with over 20,000+ active installations.

s2Member was created by Jason Caldwell, a developer from Alaska.