Instance Messager

Session Messenger - Session | Send Messages, Not Metadata. | Private Messenger [iOS] [Android]
Session is an end-to-end encrypted messenger that minimises sensitive metadata, designed and built for peop

Signal - Signal » Home [iOS] [Android]
Say “hello” to a different messaging experience. An unexpected focus on privacy, combined with all of the features you expect.

Conversations - Conversations: the very last word in instant messaging [Android]
Conversations is a Jabber/XMPP client for Android 5.0+ smartphones that has been optimized to provide a unique mobile experience.

ChatSecure - [iOS]
ChatSecure is a free and open source messaging app that features OMEMO encryption and OTR encryption over XMPP. You can connect to your existing Google accounts or create new accounts on public XMPP servers (including via Tor), or even connect to your own server for extra security.

Tox - A New Kind of Instant Messaging [iOS] [Android] [Windows] [MacOS] [Linux]
Whether it's corporations or governments, digital surveillance today is widespread. Tox is easy-to-use software that connects you with friends and family without anyone else listening in. While other big-name services require you to pay for features, Tox is completely free and comes without advertising — forever. -