self hosted

Radicale v3 Documentation (radicale.org)

https://radicale.org/v3.html

Radicale is an alternative to Baikal that is written in Python rather than PHP.

calendar, self hosted server,

The open-source, self-hostable to-do app | Vikunja (vikunja.io)

https://vikunja.io/

open source self hosted useful

awesome-selfhosted (github.com)

https://github.com/awesome-selfhosted/awesome-selfhosted

A list of Free Software network services and web applications which can be hosted on your own servers.

self hosted