htb-gen is an easy, scalable bandwidth management tool. You can set up/down portions of bandwidth for each host or network that goes through your router/firewall. Priority traffic (Web, email, gaming, FTP, VOIP, and streaming) is preferred over junk traffic (Kazaa, emule, etc). Dynamic bandwidth borrowing and reassignment is done between hosts thanks to htb boundaries. A Web frontend for config is available, so remote management is possible. It is bash-based, so it can be used in embedded routers/firewalls (wired/wireless). Two backends are available: one that generates raw tc commands, and one that generates htb-init conf files (util for integration). The packet classification is done by iptables.
Sequreisp is an ISP management software. It has a nice and powerful Web interface, and it can handle up to 3000 or more clients in a single server, thus it is oriented to small/medium ISPs and WISPs. It features load balancing, failover, prioritization, bandwidth control, P2P detection, Web cache, backup in a single file, VLAN support, and much more.