Simple bandwidth monitor and tracking tool. Basically watches usage on N number of interfaces and logs to a bolt database.
The data can then be queried back out via an HTTP API. Also includes an integrated webserver, because golang.
A very basic web API can be found at https://github.com/traetox/bwmonfrontend
Just point the Web-Root variable at the clone location and you are off to the races.