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Smoke is an encrypting chat messenger for Android written in Java.
Please read the Web site for more information:
https://textbrowser.github.io/smoke/ (original, current)
https://www.amazon.com/dp/3752691999/
https://smokeappope.sourceforge.io/ (old, third party archive)
Smoke App OPE - Open Personal Encryption
Download Android APK Installer:
https://sourceforge.net/projects/smokeappope/files/
Smoke Source:
https://github.com/textbrowser/smoke
SmokeStack Source:
https://github.com/textbrowser/smokestack (Android)
https://github.com/textbrowser/spot-on (Desktop)
Smoke appears to be one of the first projects with an open source mobile encrypting chat server., an decentralized and easily-configurable chat server.
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A web-based instant messenger client allowing you to connect to supported messengers (AIM, GTalk, MSN, Yahoo) via HTTP (or HTTPS). The Yafumato server connects to the messengers by proxy and provides a web interface, allowing IM access from anywhere.