Windows Live Messenger Alternatives

Trillian is a decentralized and federated instant messaging platform that lets your whole company send private and group messages, keep tabs on what co-workers are doing, share files, and much more.

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.

VoIPstudio is an award-winning VoIP system that offers businesses of all sizes a scalable communication solution. It’s inexpensive, easy-to-use, offers a full suite of PBX features, and is fully integrated for CRM.

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WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.

free

Get the latest, headlines, breaking, regional news fast.

Facebook Messenger is a faster way to message.

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

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.

Open Source

Miranda IM is the smaller, faster, easier instant messenger with support for multiple protocols.

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

Apps/Empathy - GNOME Wiki!

Full featured and easy to use Jabber client

Open-source video calling and chat platform.

Chat everywhere! IM+ is the most widely used mobile IM app! Connect all-in-one to MSN, Yahoo!, Goo...