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Yourphone alternatives?
(slrpnk.net)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
Matrix space | forum | IRC
I've had bad experiences with KDE Connect, specifically with group chats. Last time I used it to reply to a group chat, it sent a text to each person individually.
I'm also on Windows so that might be my fault.