This category was created to house clients which offer more than one service, for instance one which offers chat and email.
Regular Websites
Citadel is a messaging utility for BBS applications; featuring email, chat, calendar, address book, etc. - Citadel
http://www.citadel.org/
Kommuni-K funtions as one single modularized client/server software application: instant messaging, bookmark sharing, mail client, etc. - Kommuni-K
http://sourceforge.net/projects/kommunik/
Cross-platform client facilitates internet messaging, pc-to-pc calls, and videoconferencing. - Wave Three
http://www.wave3software.com/