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Sync for Lemmy - Now Released on Play Store
(play.google.com)
This is a most excellent place for technology news and articles.
I don't think Connect is open-source. To my knowledge, it's similar to Sync and Boost, a single developer working on the app as a passion project.
Oh sorry you are absolutely correct, for some reason I thought I also installed it through F-Droid. Too many Clients ๐