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.
MyQoS Free Version is a bandwidth management solution based on FreeBSD 4.X. It provides all the necessary features for a small ISP to do QoS. It is limited to 2Mb/s unless you upgrade to the Standard Version. It is distributed as an appliance image. This image can be burnt to CD for testing before installation.