riot/matrix group #piratesin:matrix.org
Riot is an instant messaging app based on matrix protocol. Matrix is decentralized by design. Both server and client is Free Software and supports end to end encryption. We hope to add matrix service to diasp.in and bridge the matrix room to our xmpp room some time.
@ambadyanands can you update the website with this information?
Those who wants to try it can install app from https://riot.im Its available for Android, iOS and GNU/Linux, Mac and Windows.
You can create an accout at matrix.org via the app or you can use disroot.org account to sign in.
I consider this a strong replacement for proprietary services like WhatsApp and Telegram.