Battleangel

“Miranda IM is a multi protocol instant messenger client for Windows. Miranda IM uses very little memory and is extremely fast. It requires no installation and can be fitted on a single floppy disc. Its powerful plugin system makes Miranda IM very flexible. Only the most basic features are built in, but there are currently more than 350 free plugins available for download that allows users to extend the functionality of Miranda IM.”

“The Miranda Instant Messenger project announces v0.4 of the award winning Miranda IM after more than a year in the making!”

Enhancements:
- Database and contact list control moved to plugins
- Relative paths for icons, sounds, and contact list background
- Scroll through past messages with ctrl+up/dn in message window
- New idle module to handle autoaway and protocol idleness
- Pin to desktop option in Window options
- Dim idle contacts option
- Use windows colours option for contact list
- New status bar options (hide bevel, hide gripper)
- Database I/O improvements
- Option to hide vertical scroll bar
- Opening a URL blocked I/O
- MSN: Sending/receiving avatar support
- MSN: Peer to peer support
- ICQ: Added avatar tab to user-details dialog to show avatar
- ICQ: My user-details now show more information & added idle since to ICQ tab
- ICQ: Added full unicode message support (requires SRMM Unicode)
- ICQ: Added support for sending and receiving Idle time
- ICQ: Added reliable client identification
- ICQ: Added support for avatar images (downloading & uploading).
- ICQ: Added Grant authorisation option (send & recognize)
- IRC: Support for secured connections using OpenSSL
- IRC: Support for CTCP and DCC filetransfers and chats
- IRC: New graphical user interface using Chat plugin
etc …

Get it here.