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.
...
A chat program that use sms.it was written in java. works on CLDC 1.1 midp 2.0 mobile devices. all messages are shown on one screen. sender and receiver must have the program to communicate. Billing is your standart sms price per message you sent.
NFC is a scalable, distributed chat server and client implemented in Java. Notable features include built in load balancing and HTTP-tunneling support. Using the load balancing, a distributed network of servers can be formed, similar to an IRC network.