Psi is a cross-platform powerful Jabber client (Qt, C ) designed for the Jabber power users. Collection, refinement and writing new patches for transfer them to Psi upstream developers.Jabber client icons in the roster (optional).Avatars of contacts in the roster (optional - on/off, left/right).Support for delivery notifications (XEP-0184: Message Receipts). The interface is very ICQ-like. Alerts appear in the contact list when events are received, and things like subscriptions requests appear as "system messages" (ICQ users know these well). Even "Chats" are queued in the contact list. Also, chats are "remembered" by default, so that you don't have to keep a bunch of windows open for each person.