Internet Chat Instant Messaging

• AOL Instant Messenger
• Google Talk
• ICQ
• Jabber
• MSN Messenger
• Yahoo Messenger

• Browser-Based

• Computers: Software: Internet: Servers: Chat: Instant Messaging 

• AwayMessages.com  - Categorized collection of away messages for AIM, AOL, Yahoo, MSN, and other instant messaging services.
• Cerulean Studios  - Creators of Trillian and Trillian Pro instant messaging clients, which allow users to IM with others on MSN, Yahoo, and AIM. Includes features, download, discussion forums, blog, and developer resources.
• CommunicationTube  - Web messenger chat client for the commonly known IM networks ICQ, MSN Messenger, Google Talk, and IRC.
• Digsby  - An integrated IM, Email, and social network monitoring client offering support for AIM, MSN, Yahoo, ICQ, Google Talk, and Jabber. Includes download, widget, blog, and support.
• IM Buddy  - Collection of various buddy icons sorted by thematic categories. With links to other pages of interest.
• IM Central  - Library of free instant messenger away messages sorted in various categories.
• IM Federation  - Association of IM networks created to advocate and support the use of open standards and directories.
• IMified  - Instant messenger buddy designed to work across all major IM networks. Features includes instant do-do's, notes, reminders, and access to other online applications.
• Micro Mobs  - Group messaging service. An easy way to manage and communicate with multiple groups.
• Miranda IM  - Open-source multi protocol instant messenger client created for Microsoft Windows.
• Pixelpainting.com  - Offers personalized buddy icons, MSN Messenger pictures, profile pictures, and desktop wallpapers.
• StarLine Messenger  - Free and dynamic instant messaging system that features avatars, emoticons, and animations.