WHCMS Free (Size: 8.43 MB)
WHMCS is an all-in-one client management, billing & support solution for online businesses. Handling everything from signup to termination, WHMCS is a powerful business automation tool that puts you firmly in control” – Matt, WHMCS Founder/Lead Deveoper
But now it is free!
Simply upload the files to your webhost and go to yourdomain.com/install and install it!