Psyced

This is psyced, a scalable multi-protocol multi-casting chat, messaging and social server solution…

Adium

Adium is a free instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.

Bitmessage Wiki

Secure messaging, anywhere

ChatSecure is a free and open source messaging app that features OTR encryption over XMPP.

Facewebinar is a free video conferencing, simple online meetings group chat into one easy-to-use…

Full featured and easy to use Jabber client

Google Voice gives you one number for all your phones, voicemail organized in an email format, free…

Open-source video calling and chat platform.

Lite version of Facebook Messenger

Make free video calls to anyone without registration.

Pidgin is an easy to use and free chat client used by millions. Connect to AIM, MSN, Yahoo, and more chat networks all at once.

Psi is a multi-platform and standards-based instant messaging client available for Windows, Linux, Mac and more.

RetroShare is a open source cross-platform, private and secure decentralized communication system.

Anonymous instant messaging for real privacy

Sideline™ is the free 2nd number for your smartphone. It uses your existing carrier network so your 2nd number works anywhere your cell phone does.

Fast, simple & secure messaging. Privacy that fits in your pocket.

Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.

is the open standard for messaging and presence.