DebugBar V5.1.1 is an Internet Explorer plug-in that brings you new powerful features :
DOM Inspector: View DOM Tree and modify tags attributes and css attributes on the fly to test your page HTTP Inspector: View HTTP/S request to check cookies, GET and POST parameters, view server info Javascript Inspector and Javascript Console: View javascript functions for easier debugging, see Javascript and AJAX code HTML Validator: Validate HTML code to correct and optimize your code and html size of your page And many more features: See page cookies, get pixel color on a page, make a page screenshot...
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 Instant messaging without installation - mabber runs in your browser! Use it on your mobile phone.
 radiusIM is The Social IM. Connect with people from all over the world and IM with your buddies on MSN, AIM, Yahoo and GTalk.
Web messenger for the web, access instant messaging from anywhere whether you are behind a firewall, at at school, at work and from any other location.
 ILoveIM Web Messenger service lets you stay connected with MSN, Yahoo, AOL (AIM) and Gtalk messengers. There is no need to download and install anything into your computer to use our web messenger.
 meebo, the web messenger that lets you access IM from absolutely anywhere. meebo supports msn, yahoo, aol/aim, google talk (gtalk), jabber and icq.
 Get Web IM from AIM Express. AIM Express is a web-based instant messaging program that lets you chat using your browser without downloading any software.
Yahoo! Messenger for the Web - Instant message with your Yahoo! and Windows Live Messenger friends immediately. No download or installation required.
connect to Google Talk on the web: Launch Google Talk Gadget (No Download Required!)
 imo is a web messenger and video chat service. It lets you IM your buddies on AIM, Google Talk, MSN, and Yahoo. It's fun, easy to use, and requires no downloads.
ebuddy web messenger (former e-messenger) is a web instant messaging that let you chat with MSN, AIM, YAHOO, GTALK and MYSPACE even if you are blocked by firewall
 MSN Web Messenger lets you talk online and in real-time with friends and family using just a web browser! Use it on any shared computer - at school, at work, at a friend's house or anywhere you can't install the MSN Messenger software.
Coccinella
Chat Client With Whiteboard
- File transfer
- Multi-User Chat
- Secured connections
- Avatars and emoticons
- Open standard instant messaging
- Multi-lingual and internationalized
Psi IM
Psi is a free instant messaging application designed for the Jabber IM network (including Google Talk). Fast and lightweight, Psi is fully open-source and compatible with Windows, Linux, and Mac OS X.
With Psi's full Unicode support and localizations, easy file transfers, customizable iconsets, and many other great features, you'll learn why users around the world are making the switch to free, open instant messaging.
Kopete
Kopete is an instant messenger supporting AIM, ICQ, MSN, Yahoo, Jabber, IRC, Gadu-Gadu, Novell GroupWise Messenger, and more. It is designed to be a flexible and extensible multi-protocol system suitable for personal and enterprise use.
The goal of Kopete is to provide users with a single easy-to-use way to access all of their instant messaging systems. The interface puts people first, and is integrated with the system address book to let you access your contacts from other KDE applications. IM can be intrusive, but Kopete's notification system can be tuned so that only important contacts interrupt you.
Xfire
Track, message, and talk to your gaming friends, join them in games, browse servers, take screenshots and download patches. Xfire supports over 1000 games including World of Warcraft, Call of Duty and Counter-Strike.
Digsby
digsby is a multiprotocol IM client that lets you chat with all your friends on AIM, MSN, Yahoo, ICQ, Google Talk, and Jabber with one simple to manage buddy list.
Adium - for Mac OS X

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

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