aMember

It has support for PayPal, BeanStream, 2Checkout, NoChex, VeriSign PayFlow, Authorize.Net, PaySystems, Probilling, Multicards, E-Gold and Clickbank payment systems and allows you to setup paid-membership areas on your site. It can also be used without any payment system - you can manage users manually.

aMember Pro also supports integration plugins to link with third-party scripts databases (like vBulletin, Invision Board). aMember is a perfect membership software for selling digital subscriptions and downloads, and it can be used for other applications as well.

Features:
- Integrated with multiple payment systems. Able to support multiple payment systems simultaneously.
- Password sharing prevention built-in ($80 value!)
- Free installation included ($74.95 value!)
- Built-in 1-tier affiliate program with recurring commissions support
- Free downloadable trial available
- Special cookie login interface where members can login, review payments, renew subscription. Your visitors will never see the ugly browser log-in window again!
- Automated signups and mail to new and expired users
- Can be used to setup free areas on site, requiring only registration, not payment (possible after admin approval)
- Easy web based administration, all management is done through your browser
- Protection plugins. The script handles authorization using plugins. Additional plugins can be easily added to provide integration with customer support software, forums, etc. feel using your favorite web site editor

Requirements:

· PHP 4.1.0 or later
· MySQL 3.22 or later
· Unix/Linux hosting
· Ability to load ionCube Loader dynamically (usually possible without any additional settings)
· OR Zend Optimizer installed into php.ini
· OR ionCube Loader installed into php.ini.