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RPI4/400 is perfectly capable as a little home server. All it needs is a good SD card.
Owntracks,photoprism,monocker,brave go m-sync,libre photos,wallabag,radicals e,Baikal,Firefox sync,Joplin web,webdav server,jellyfin,vaultwarden,wireguard
Davx⁵ has Mac OS caldav carddav server integration so you can sync with it.
https://www.davx5.com/tested-with/calendar-and-contacts-server
On android you can use simple calendar or etar to view calendars and “tasks” or jtxboard for tasks/journals
Icard is actuality the only alternative that can register as a contactless nfc payment that not relying on google/Apple wallet and its perfectly safe. It’s an actual bank in Bulgaria and is eu regulated and PCI certified
Not Foss. Kinda of a privacy nightmare as you need to verify your identity and location with actual documents but as already said its not google and is a solid option if you are degoogled.
Your options in aftermarket OS fall in to 3 categories imao
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those that support relocking the bootloader (grapheme,calyx,divest, other smaller projects maybe)
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vanilla roms with signature spoofing permission so that you can have microg on them. Some even come with microg preinstalled (/e/,lode,Los4mg) And some are gmscomat compatible (voltage,awaken,spark). There are plenty but they don’t care about signed images and relocking.
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some unofficial build from any of the above from a maintainer that cares to sign his own images so that you can relock your BL as your device supports it.