Trillian

Trillian is a free fully featured, stand-alone, skinnable chat client that supports chatting on Windows Live, Facebook, Twitter, Yahoo, MySpace, AIM, Email, Google Talk, Skype, ICQ, Jabber, IRC, and Bonjour. It also helps manage your social networks such as Facebook and Twitter. Trillian provides capabilities not possible with most original network clients, while supporting standard features such as audio and video chat, file transfers, group chats, buzzing, tabbed chats, tablet-based drawing, message history, plugins, avatars, multiple simultaneous connections to the same network, typing notifications, proxy support, and encrypted messaging.

Features and Highlights

Continuous Client
Your chats go with you everywhere. Trillian even keeps your phone quiet when you're active at a desktop!

Interoperable
With support for Google Talk, Facebook, MSN, AIM, ICQ, Yahoo!, and more, stay connected with everyone.

Device Support
The app is available on Windows, Mac, iPhone, iPad, Android, BlackBerry, and directly in your web browser.

Email
POP3, IMAP, and native IM mail integration. New mail alerts and basic mail management are all exposed.

Social
Never miss a beat with the tool's social integration, keeping you connected to Facebook, Twitter, and LinkedIn.

Tabbed Chats
Keep your desktop tidy with tabbed chats, featuring drag and drop support, unread indicators, and more.

Message History
All desktop versions of the app come with a fully-featured message history viewer, including searching and filters.

Spellcheck
The program's integrated spellcheck will always let you know when a word is misspelled and offer suggested fixes.

Emoticons
Hundreds of amazing handcrafted emoticons for your chatting pleasure. Find them all, even the hidden ones!

Game Chat
New to the software for Windows, you can now chat directly in full-screen games with the awesome in-game chat feature.

Themes
Skins and themes let you personalize the app for Windows any way you'd like. Change colors to suit your mood!

Internationalization
User-created language packs and strong UTF-8 support help ensure a great experience in your native language.

Also Available: Download Trillian for Mac