Open source WebHTB and WebHTB Professional are offering you a very easy bandwidth limitation for any IPv4 Ip addresses (public or private). It is perhaps the only and the best application in the world who make shapping by psihical MAC adresses. Also you can make traffic shapping by iptables mark, that helps you to use layer7, IMQ or SQUID ZPH very easy. Maybe the most important thing is that you must not compile a thing.
Only with WebHTB Professional you will have the chance to see graphic statistics for each client or groups of clients, view realtime traffic for each rule without upload or client with upload by ip, otherwise Open WebHTB is offering you just view realtime traffic by rules without upload.
Now WebHTB Professional may create powerfull encrypted back-up files, any time you want, or just wait for midnight to receive one of that file in your email. Restoring requires just two clicks from the user.
WebHTB Professional gives you the chance to create invoices in PDF format any time you want or just schedules the date for automatically creation and sending to clients via e-mail. Also you have the chance to set expiry contract dates and webhtb will block internet services for your clients.