Miranda IM

Product: Miranda IM v0.8.22
Website: www.miranda-im.org
Type: Free
Requirements: Windows XP/Vista/7

Miranda IM is a multi-protocol instant messaging client for Windows. Very light on system resources and extremely fast, Miranda IM requires no installation and can be made to fit on a single floppy disk or USB drive. Featuring a powerful plugin-based framework and boasting over 350 plugins, Miranda IM is one of the most flexible and customisable messaging clients on the planet.