- Adium X
 - Multiple protocol instant messaging client for Mac OS X. - Agile Mobile
- All-in-one MSN, AIM, Yahoo!, ICQ, and GoogleTalk mobile phone IM client.
- AIMM
- Clone of AOLs IM (AIM) client.
- AOL Instant Messenger (AIM) (70)
- Auction Messenger
- Automatically logs into an eBay account, pulls all activity, and displays it in an intuitive format.
- Away Messages.com
- Away messages for you to use with your instant messaging service.
- BigBlueBall.com
- Chat and instant messaging news, downloads, emoticons, and lingo.
- Eyeball Chat
- Instant video messenger that supports AOL, MSN, and Yahoo!, as well as live video chat with a webcam.
- Fire
- Instant Messenger client for Mac OSX that handles AOL Instant Messenger, MSN Messenger, Jabber, ICQ, and Yahoo! Messenger communications.
- FireBall
- Features password protection, message encryption, contact blocking options, images, sounds, hyperlinks formatting, and more.
- Google Talk
- Google Talk provides instant messaging (IM) and voice messaging.
- Gush
- Messenger programme with split chat, news reader, conversation management, and more.
- HowStuffWorks: How Instant Messaging Works
- Escribes what the major IM programmes are, what makes them different from each other ,and what the future holds for IM.
- Huminity
- Social networking and chat software.
- ICQ (13)
- Imici
- Develops free instant communications applications that keep users in touch with their friends, family, and associates.
- IMVU
- 3D instant messenger with customisable home pages.
- Instant Messaging Planet
- Covers the wireless, enterprise, and public instant messenger worlds.
- Jabber (4)
- Joe GALAXY
- Communications application including IM, as well as communications, broadcasting, and dialup-access.
- Lycos Instant Messenger
- Communicate directly with friends and family.
- MECA Messenger
- Chat programme combines buddy lists from AIM, ICQ, Yahoo!, and MSN messengers all in one interface with unique IM skins, themed content, and translation.
- Meebo.com
- Offers all-in-one instant messaging services via Yahoo! Messenger, MSN, AOL, ICQ, and Jabber.
- Miranda ICQ
- Open source ICQ clone.
- MyIMZone
- Web-based messenger for friends to reach each other on AIM, Yahoo, MSN, or Google Talk.
- Net-Session
- Chat programme that allows the use of video cameras and microphones.
- Odigo (2)
- OMNI
- Combines instant messaging, file sharing, and web search clients into a single, cross-network programme.
- Orgoo
- Web-based application which allows users access to all of their IM accounts, email accounts, SMS, and video chatting in one place.
- Paltalk
- Chat with users in live voice and video chat rooms for free.
- Pidgin
- Multi-protocol instant messaging client for Windows, Linux, BSD, and other Unix systems that works with a number of messaging services including AIM, ICQ, MSN Messenger, Yahoo!, Bonjour, IRC, and Zephyr. Formerly known as Gaim.
- Project SCIM (Secure Cryptographic Instant Messaging)
- Encryption software for instant messaging applications.
- RhymBox
- Instant messenger client using the Jabber protocol. Features encryption, custom emoticons, interoperability, and more.
- SeeStorm Messenger
- Voice and text chatting along with 3D talking characters.
- SmarterChild
- Interactive agent built by ActiveBuddy. Delivers content and services to instant message windows.
- Social.im
- Instant message with your Facebook friends using this external IM client.
- Sprint Instant Message
- Send messages or chat online in privacy.
- TiK
- AOL IM client written in tcl, developed as an alternative to Java AIM for UNIX users.
- Trillian
- Instant messager system with support for AIM, ICQ, MSN, Yahoo!, and IRC. Multiple simultaneous logins allowed, skinnable interface using XML, multiple server support, dcc encryption, and more.
- Unimobile
- Product works as desktop or wireless interface that enables desktop messaging, personal email delivery, and delivery of custom Internet content.
- Verizon Wireless Mobile Messenger
- Send text messages through Verizon Wireless with this companion website for use by subscribers to Mobile Messenger.
- visitalk.com
- Offers voicemail, instant voice and video messaging, and a directory of personal communications numbers.
- Wacky B
- Offers news, information, instructions on making smileys, and reviews of instant messaging programmes.
- WebmasterRole
- Homepage communication tool offering messaging, file transfer, and browser control from webmaster to visitors in real-time.
- WhoIsOnline@
- Client-free Direct Messaging Application (DiMAp) providing chat and messaging features.
- Windows Live Messenger (20)
- Xfire
- Instant messenger for gamers shows when friends are playing online and what games they're playing. Receive IMs without interrupting play.
- Yahoo! Messenger (15)
 Yahoo! Singapore Messenger
- Exchange messages with friends online.- Yahoo! Singapore Messenger for the Web
- Web-based version of the Yahoo! Messenger programme, allowing users to chat with contacts from any computer. Features custom display pictures, and emoticons.
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