goreplay
https://github.com/buger/goreplay

tcpcopy
https://github.com/session-replay-tools/tcpcopy

teeproxy
https://github.com/chrislusf/teeproxy

duplicator
https://github.com/agnoster/duplicator

goduplicator
https://github.com/mkevac/goduplicator

nginx mirror

haproxy mirror