Tango was discontinued by Google, but don't worry we have compiled a list of Tango Alternatives:
A messaging app for teams who see through the Earth!
Students, they spend hours talking to other students.
Apps/Empathy – GNOME Wiki!
Say hello to the only messaging app you need.
ICQ is one of the oldest instant messengers.
Fast, simple & secure messaging. Privacy that fits in your pocket.
Instant screen sharing. Instant Aha!
Adium is a free instant messaging application for Mac OS X that can connect to AIM, MSN, Jabber, Yahoo, and more.
Kakao Talk is a multi-platform texting app that allows iPhone, Android, and BlackBerry users to send and receive messages
Real-time picture chatting.
Free, open source and cross platform messaging and emailing app that combines common web.
Infinitely flexible. Incredibly easy to use. Great mobile apps. It’s free. Trello keeps track of everything, from the big picture to the minute details.