Originally Posted by fris

lots of membership plugins out there, most only provide paypal, but a few offer other processors.

here are some

http://wp-member.com/

http://www.newmedias.co.uk/wordpress-membership/

http://www.memberwing.com/

http://member.wpwishlist.com/

also you can integrate amember pro with wordpress

http://www.amember.com/