Raven Messenger

Raven is a universal and secure messenger. It combines SMS, facebook messages and E-Mail all in one app. Unlike other messenger apps this app uses strong encryption standards and a unique new ways to initiate secure communication.
Raven was developed by three students as their thesis project in 2014 - 2015.
This app is open source, published under GPL3 https://github.com/manuelsc/Raven-Messenger

This distribution includes cryptographic software. The country in which you currently reside may have restrictions on the import, possession, use, and/or re-export to another country, of encryption software. BEFORE using any encryption software, please check your country's laws, regulations and policies concerning the import, possession, or use, and re-export of encryption software, to see if this is permitted. See http://www.wassenaar.org/ for more information.