• Radicale hosts my calendars and contacts
• zero-hassle setup in Thunderbird for both of those things
• DAVx on Android works seamlessly for calendar and contacts Sync
• Fossify calendar to view, edit calendar
• default contact app for contacts
• Infcloud as a web frontend for Radicale. Not pretty, but absolutely functional (and I hardly ever need it thanks to Android calendar app / Thunderbird)

Haven’t tried todo lists yet, but I would imagine they are similarly hassle-free.

The only annoyance I have is that DAVx is required at all, but I’d suspect that’s an Android/Google issue? IDK.

But anyways, this setup works flawlessly for me.

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Thunderbird doesn’t even need a plugin. Just “add new calendar” > “on the network” > enter the URL. Done.

Same for contacts.