Your Android phone has iMessage skills. How to use Google
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. The best encrypted messaging apps for iOS and Android Powered by the open-source Signal Protocol, the app secures your conversations end to end. For Signal users, privacy is part of the app In-app Messaging and Chat API. Adding in-app messaging in your apps using Mesibo's API is as simple as selecting the destination and sending the message. You also get the status of each sent message in real-time; e.g., Sent, Delivered, Read, etc. Dec 11, 2019 · The best thing about this private messaging app is that it is open source. Hence, the experts can freely inspect the app’s code for any flaws in its security. In December 2013, it was announced that the messaging protocol that is used in Signal had successfully been integrated into the Android-based open-source operating system CyanogenMod.    Since CyanogenMod 11.0, the client logic was contained in a system app called WhisperPush.
Aug 27, 2013 · Open Source Android SMS and MMS Library. In our continuing coverage of the App Development forums here at XDA, we’ve featured various open source libraries that enable you to quickly add in
Jul 10, 2020 38 Amazing Open Source Android Apps written in Java | by Dec 13, 2017 GitHub - moezbhatti/qksms: The most beautiful SMS
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Dec 11, 2019 Best Text Messaging Apps for Android - xda-developers