MoonGen is a fully scriptable high-speed packet generator built on DPDK and LuaJIT. It can saturate a 10 Gbit/s connection with 64 byte packets on a single CPU core while executing user-provided Lua scripts for each packet. Multi-core support allows for even higher rates. It also features precise and accurate timestamping and rate control.
Variant of replay-pcap with support for multiple interfaces and multiple pcap files.
I used this for load testing an instance of Suricata connected with four fibres to my testing host.