With so many different chat mediums such as MSN Messenger, AOL Instant Messenger, ICQ and IRC available today, there needs to be a single unified program for people to communicate with. I have used several messengers, such as AIM, ICQ, MSN, IRC, Yahoo Messenger etc. However, here I will commend you a fully featured, stand-alone, skinnable chat client that supports AIM, ICQ, MSN, Yahoo Messenger, and IRC. That is Trillian which was published by Cerulean Studios. With Trillian we can chat with all friends of ours who use different messenger. If you want to chat with your friends just use only one messenger as me, Trillian is the best choice. Following is the detailed introduction of this universal messenger.

Trillian is a fully featured, stand-alone, skinnable chat client that supports AIM, ICQ, MSN, Yahoo Messenger, and IRC. It provides capabilities not possible with original network clients, while supporting standard features such as audio chat, file transfers, group chats, chat rooms, buddy icons, multiple simultaneous connections to the same network, server-side contact importing, typing notification, direct connection (AIM), proxy support, encrypted messaging (AIM/ICQ), SMS support, and privacy settings. Trillian provides unique functionality such as contact message history, a powerful skinning language, tabbed messaging, global status changes (set all networks away at once), Instant Lookup (automatic Wikipedia integration), contact alerts, an advanced automation system to trigger events based on anything happening in the client, docking, hundreds of emoticons, emotisounds, shell extensions for file transfers, and systray notifications. With Trillian, all these chat networks are combined into a powerful, easy to use program. The latest version of Trillian is 3.1.9.0 and the new features and functions of it include: Improved speed, such as start-up time, icon rendering speed and more. Biography (AIM Profiles). Universal Plug-and-Play (UPnP). Windows XP user with UpnP-enabled routers will benefit from vastly improved file transfer success rates. On the fly link/emoticons. Font face support in Ims. Undo in edit area. Orphaned contacts (no more merging). Many IRC enhancements. Better Yahoo file transfers. Multiple Identities are now possible using the new Identities and Connections Manager. No more contacts Lists Merging. Trillian will not merge contact lists between different accounts any more, even if we accidentally place them both in the same section and much more.

Trillian 4.0 Build 119 is a Instant Messenger product from trillian.im, get 5 Stars SoftSea Rating, Trillian is a fully featured, stand-alone, skinnable chat client that supports AIM, ICQ, MSN, Yahoo Messenger, and IRC. It provides abilities not possible with original network clients, while supporting standard features such as audio chat, file transfers, group chats, chat rooms, buddy icons, multiple simultaneous connections to the same network, server-side contact importing, typing notification, direct connection (AIM), proxy support, encrypted messaging (AIM/ICQ), SMS support, and privacy settings.

Trillian provides unique functionality such as contact message history, a strong skinning language, tabbed messaging, global status changes (set all networks away at once), Instant Lookup (automatic Wikipedia integration), contact alerts, an advanced automation system to trigger events based on anything happening in the client, docking, hundreds of emoticons, emotisounds, shell extensions for file transfers, and systray notifications.
The license of this communication software is Freeware, you can free download and free use this Communication software.