I don't know of any calDav, cardDav servers written in Go, but i have heard of the following popular servers: * https://radicale.org https://radicale.org - wri

I don't know of any calDav, cardDav servers written in Go, but i have heard of the following popular servers: * https://radicale.org https://radicale.org - written in python. * https://sabre.io/baikal/ https://sabre.io/baikal/ - written in php...which i see that you are not so crazy about...but i note it only because it is quite solid reputation. I'm curious why would you want a calDav, cardDav server written in Go? Is it for scalability? Or, ease of deployment? I am not judging your preference at all; i'm genuinely curious? Also, separately, i first learned of cyrus imap from a blogpost that FastMail folks posted, but do not much about it (other than it is highly respected as a platform for mail, calendar, contacts)...Is it built in Go?