tcpconnbenchmark
Concurrent TCP connection tester: live stats, source interface or address choice, CSV export.
About
A TCP concurrent connection tester for macOS, Windows and Linux, drawn with MyGo's native UI, with a command-line mode too. It only resolves DNS and opens TCP connections to port 80, 443 or both, without HTTP or TLS, and shows stats live. You pick the outgoing interface or an IPv4 or IPv6 source address, set duration, rate and a failure limit, and can save the results as CSV.