A WhatsApp client library for NodeJS that connects through the WhatsApp Web browser app
QPython is the Python engine for android. QPython Ox is mainly aimed at programming learners, and it provides more friendly features for beginners.
K-9 Mail – Open Source Email App for Android
Braintree SDK for Android
Telegram for Android source
ChatSecure is a free and open source encrypted chat client for iOS that supports OTR and OMEMO encryption over XMPP.
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Dialogflow agent fulfillment library supporting v1&v2, 8 platforms, and text, card, image, suggestion, custom responses