A client/server network performance benchmark (debian package: netperf).
Flent (previously netperf-wrapper)
For his measurement work on fq_codel, Toke Høiland-Jørgensen developed Python wrappers for Netperf and added some tests, notably the RRUL (Realtime Response Under Load) test, which runs bulk TCP transfers in parallel with UDP and ICMP response-time measurements. This can be used to expose Bufferbloat on a path.
These tools used to be known as "netperf-wrappers", but were renamed to Flent (the Flexible Network Tester) in early 2015.