I've worked on a lot of projects over the years and most have been proprietary, but the few I can mention that I enjoyed working on the most are listed here.
Script to aid in the benchmark testing of Go
A Prometheus exporter for the Technicolor TC4400 cable modem
Raw socket networking with support for AF_PACKET and SO_TIMESTAMPING
High level wrapper for programmatically managing nftables' expressions, rules, and BPF filters
An implementation of the Bitcask database in Hare
Various modules mostly centered around networking in Hare
Various modules mostly centered around networking in Go