Jabbin!

Riot (formerly Vector) is an opensource interoperable app running on Web, iOS and Android. It is built around chat rooms, both public and private and provides messaging, filesharing, voice and video conferencing (beta on Android and web), integrations to tools like GitHub, Jira, Jenkins and much more soon. Vector is built on the Matrix.org open standard which provides bridges to other systems such as Slack, IRC and a lot more soon. One can use the hosted service or run their own. »

Linphone is an internet phone or Voice Over IP phone (VoIP). With Linphone you can communicate freely with people over the internet, with voice, video, and text instant messaging. Linphone makes use of the SIP protocol, an open standard for internet telephony. You can use Linphone with any SIP VoIP operator.

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

Empathy is a messaging program which supports text, voice, video chat, and file transfers over many different protocols. You can tell it about your accounts on all those services and do all your chatting within one application.

Open source Jabber (XMPP) client with multi-account support, clean and simple interface. Being both free (as in freedom!) and ad-free, Xabber is designed to be the best Jabber client for Android .

Technitium Bit Chat is a secure, peer-to-peer (p2p), open source instant messenger designed to provide end-to-end encryption. Primary aim of developing this instant messenger is to provide privacy which is achieved using strong cryptography. It can be used over Internet and private LAN networks for instant messaging and file transfer.

WeeChat is a fast, light and extensible chat client. It runs on many platforms (including Linux, BSD and Mac OS).

Cyanide is Tox client for Sailfish OS .

GoldBug is a secure Instant Messenger. You can be sure with using GoldBug (GB), that no third party can look into your chat communication. Private user-to-user communication remains private. GoldBug therefore uses strong multi-encryption with different layers of modern encryption technologies of well known and revised crypto libraries (like libgcrypt (GnuPG) and OpenSSL). The app offers as well decentral and encrypted Email and decentral public E*IRC-Chat.

yaxim Feb 7th, 2013 yaxim (Yet Another XMPP Instant Messenger) is a Jabber/XMPP client with open source (GPLv2). Why pay for text messages if you …

- Qt E-Mail Client.- Build-in Encryption to secure E-Mails- Secure P2P Email from Friend to Friend without relying on a central server.- Chat and Instant Messaging is build in. Define & Add your friends.- Additionally a full decentral P2P Email-Option- Additional Security Layer with the GB-Feature for Emails.- Strong e2e Multi-Encryption (PGP-kind/AES over SSL: using libgcrypt).- Store Email for Offline-Friends in the P2P Network.- Preventing Data Retention (VDS). WoT-less.- Full decentral Email-Network using the Echo Protocol.- HTTP & HTTPS Connections.- Key- / Repleo-Exchange.- Libspoton Integration.- Open Source. BSD License. »

Speeqe is a web based client to XMPP/MUC rooms

Talkonaut is a free Jabber (XMPP) client for your iPhone or iPod with free peer-to-peer voice calling over Jingle Audio extension compatible with GoogleTalk™. Talkonaut can be used with any standard Jabber account like Gmail, Gizmo5™, Jabber.ru or from your corporate Jabber server. If you do not have a Jabber account yet, you can register one right from the Talkonaut. Talkonaut supports a number of XMPP extensions including multi-user conference chat (XEP-0045), file and image sharing (XEP-0047, XEP-0065), vCard based avatars (XEP-0153) and many others. »