RUDE: "RUDE is a small
and flexible program that generates traffic to the network, which can be
received and logged on the other side of the network with the CRUDE."
trafgen: part of netsniff-ng
suite ("netsniff-ng is is a free, performant Linux network analyzer and
networking toolkit. The gain of performance is reached by 'zero-copy'
mechanisms, so that the kernel does not need to copy packets from
kernelspace to userspace and vice versa.")