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router7
router7 is a small home internet router completely written in Go. It is implemented as a gokrazy appliance.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
maybe https://github.com/rtr7/router7
also https://github.com/google/gvisor/tree/go is a container runtime in go, including netstack and a bunch of stuff. not quite an os, but it has a lot of low level stuff.
EggOS looks pretty close. Goose too. At least, they're Go programs designed to boot on bare metal.
I'm sure it would be a fun proof of concept, and there seem to be some projects like https://github.com/gopher-os/gopher-os , but they themselves admit it's just a proof of concept. Every tool has its use.