Xfire

This clear, easy to use and light-weight IM client offers a set of corporate features. Based on a client/server architecture the messenger is fully managed from server-side software which provides IM logging, user grouping, offline messaging.

Simulates webcam on your system by broadcasting video files as webcam. It adds a virtual camera to your system without having an actual webcam. It can be used with all instant messenger like MSN, Yahoo, AOL, ICQ, Camfrog Video Chat.

Stream/play videos and movies on Yahoo, MSN, AOL, Paltalk, ICQ, Camfrog, and on all messengers instead of actual Webcam. It streams videos and movies on your messenger just like a webcam.

123 Flash Chat Server Software can add a chat room to your website in minutes. It is a live chat solution for the high-load social network, dating site, online conference, etc. It has multiple skins and seamless integration to your database.

Pidgin is a multi-protocol Instant Messaging client that allows you to use all of your IM accounts at once.