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React Native NFC module for Android & iOS
Standard Notes for iOS and Android - https://standardnotes.org
Periodic callbacks in the background for both IOS and Android
Learn Flutter and Dart to Build iOS and Android Apps, published by Packt
Boostnote for iOS and Android
Next generation iOS and Android apps for Mattermost in React Native
IRMA app for iOS and Android
The Zulip app for Android and iOS.