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Not sure how many of these are open-source but it’s a good start
https://github.com/dbeley/awesome-lemmy#mobile-apps
You can also “install” the mobile web version as an app. Just go to your home instance lemmy.one and and fromthe menu on your phone’s browser, there’s usually an install button.
This also works for Voyager, https://vger.app/posts/lemmy.one/all