Thank you! I was wondering if there would be one soon. Glad some people were already offering to do the job.

I recommend something like the app DavX if you want to sync your calendar to Nextcloud or something.

I use a Navidrome server and ProjectBlue app on my Android. I haven’t figured out how to download music for offline use by using my ProjectBlue app though.

OrganicMaps and CoMaps are also good similar options.