Descriptions : A free and open source Jabber / XMPP client for Android. Easy to use, reliable, battery-friendly. With integrated support for pictures, group chats and e2e encryption.
Features :
+ End-to-end encryption with OMEMO or OpenPGP
+ Encrypted audio and video calls (DLTS-SRTP)
+ Send and receive pictures
+ Intuitive user interface that complies with Android design guidelines
+ Images / avatars for your contacts
+ Synchronized with the desktop client
+ Conferences (with support for bookmarks)
+ Address book integration
+ Multiple accounts / single inbox
+ Very little effect on battery life
Required Android Versions : Lollipop [5.0–5.0.2] - Marshmallow [6.0 - 6.0.1] - Nougat [7.0 – 7.1.1] - Oreo [8.0-8.1]