AMember is a flexible membership and subscription management PHP script. It has support for PayPal, BeanStream, 2Checkout, NoChex,VeriSign PayFlow, Authorize.Net, PaySystems, Probilling, Multicards, E-Gold and Clickbank payment systems (see list of integrated 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.

Upload all files in BINARY mode.
Run validator.php before editing files to verify release.
Use online verifier of validator.php file and you will see NFO file.
Remove both files from server after checking and enjoy.
Remember, we include validator.php and checksums.md5 in our releases.
If you don’t see these files, don’t trust.
Do not modify validator.php.