UDP latency tester, round-trip/1-way/jitter etc
IRTT (Isochronous Round-Trip Tester) is software that runs on a client and server, using its own UDP-based protocol to allow measurements including round-trip time, one-way delay (assuming the clocks are synchronized), and lost/out-of-order/duplicate packets. It has features for reasonably secure use on both public and private servers, including optional HMAC (access control) and three-way handshake (anti-spoofing).
Homepage: https://github.com/heistp/irtt
Maintainer: Stuart Henderson <stu.ports@spacehopper.org>