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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
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.
https://github.com/deku-messaging/Deku-SMS-Android
Supports emoji & images Supports e2ee if the other party also have deny SMS installed Supports message forwording
Google bans new acounts that never used in official playstore before
Use a spare gmail acount that you have also used with playstore
Anonymus logins also get rate limits or get banned
As for alternative
App lounge from /e/ OS uses auroraOSS Gstore api to download from playstore so it’s basically like using aurora
Other than that the are Python scripts you could use on termux but those also need a proper gmail account
Same apply to linux/windows programs available
I always used my “normal” google account in Aurora also been using this account with microg since ages Never had an issue I don’t care if the account gets banned though.
Maybe appkmirror is the only other “sane” option.