Apps with 'OTR' feature
Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!
Conversations is a privacy focused, open source XMPP Texting [Jabber] client for Android 4.0+ smart phones with wife-approved easy encryption [OTR, OMEMO, or GPG].[Note]
Adium is a free and open source instant messaging application for Mac OS X, written using Mac OS Xs Cocoa API, released under the GNU GPL and developed by the Adium team.
ChatSecure is a free and open source messaging app that features OTR encryption over XMPP.
The goal of Gajim is to provide a full featured and easy to use XMPP client. Gajim works nicely with GNOME, but does not require it to run.
A development branch of the Psi XMPP client. Psi is a cross-platform powerful XMPP client (Qt, C++) designed for the XMPP power users.
An encrypted instant messaging with video call and GPS features for android.
Zom's security and privacy features are powered by the amazing foundation created by the ChatSecure project, and works with other great apps like Conversations.No screenshots yet
Sipnetic is a free VoIP softphone based on the SIP protocol. Sipnetic supports voice and video calls, instant messages, presence information and end-to-end encryption.
StealthChat is a new secure app for calling and chatting with your friends and partners. With advanced encryption technology, your phone calls and chat messages are private.