I use a caldav calendar on my server. Clients sync with it. I use on linux: gnome calendar, windows: thunderbird, android: simple calendar

Onlyoffice

Sea of stars, brotato

if there are none locally, you can use the lrclib plugin to find lyrics

Lyrics work :)

I partially agree, but I think the switch (or generally nintendo consoles) exist beside other consoles and there is no real fight.

You could write your content in markdown and use pandoc to generate a html file. Add header/footer in template if you want

Jellyfin or funkwhale

Huh, sad to hear. Do the recipe sources have the recipe markup or is it parsed directly from html?

For meal planning and shopping lists, grocy os completely overkill.

You could look at Kitchen Owl, it even looks like bring! and you can use meal planning :)