Originally Posted by RazorSharpe

Quite a few out there:

This one was used quite widely back in 1999 - 2000:
http://www.siteinteractive.com/acctman/

More can be found here: (if you want a cgi/perl based system)
http://hotscripts.com/CGI_and_Perl/S...ent/index.html

php solutions can be found here:
http://hotscripts.com/PHP/Scripts_an...ent/index.html

hope that helps ...