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I am surprised noone mentioned Kong [1] yet. It seems to implement most of stuff promised by Unit and it was around for a few years.

Not sure how it is related. Unit is an app server, it runs app processes and manages them, handles graceful restarts and etc.

Kong is just an API gateway: you run your own infrastructure as usually and put a gateway on top of it.

>Build the foundation of your service mesh.

Not directly related as Unit seems to be advertised as app server primarily, but you can see quoted text on main page.

The last I saw Kong didn't support microcache, which is one of the best nginx features IMHO.