Licq
- Licq is a multi-threaded ICQ clone with a Qt/KDE-Interface.
- http://licq.sourceforge.net/

KSendFax
- Graphical utility to send faxes.
- http://ksendfax.sourceforge.net/

xIrc
- IRC Chat Client.
- http://sourceforge.net/projects/xirc/

Konversation
- A user friendly IRC Client for KDE3.x .
- http://konversation.sourceforge.net/

Kit AIM Client
- A Messaging client for the AOL Instant Messenger.
- http://www.hakubi.us/kit/

KMailCvt for KDE 2
- Now part of KDE itself, maintaining the separate package was stopped. This site shows the manpage for the program.
- http://ftp.kde.com/Communications/Mail/KMailCvt/

KSendmail
- A management system for Sendmail, designed to make Sendmail administration tasks easy.
- http://ftp.kde.com/Administration/Mail/KSendmail/

KMerlin
- An IM (instant messaging) client for the MSN messenger network.
- http://sourceforge.net/projects/kmsn

kShowmail
- A small program to load mail from pop3 servers and display relevant header fields, complete mails, and some other stuff.
- http://kshowmail.sourceforge.net/

Kyim
- An Instant Messenger for Yahoo Networks. It support basic connection to the Yahoo! Networks system, and connection through HTTP proxies. Screenshots, downloads, credits.
- http://kyim.sourceforge.net/

Kopete
- A flexible and extendable multiple protocol instant messaging system designed as a plugin-based system. Screenshots, download, plugins, documentation, FAQ, news.
- http://kopete.kde.org/

KMail
- A fully-featured email client that integrates into the K Desktop Environment.
- http://kmail.kde.org/

Konverse
- A KDE-based Jabber client. Jabber is an open-source instant messaging protocol.
- http://konverse.sourceforge.net/

Kiltdown
- An open source mail client for UNIX.
- http://kiltdown.sourceforge.net/index.html

KImap
- An E-Mail Client for KDE 1.X and the IMAP-Protcol.
- http://kimap.sourceforge.net/

KLassie
- A Kicker Panel Applet to allow you to display how many email messages you have waiting.
- http://klassie.sourceforge.net/

KNewMail
- KNewMail is designed to check multiple email servers, including POP3, IMAP, and Local files for waiting mail and then notify the user of the waiting mail.
- http://www.slac.com/mpilone/projects/knewmail.phtml

KPopup
- A program, for sending and receiving Microsoft(tm) WinPopup messages.
- http://www.henschelsoft.de/kpopup_en.html

KSalup
- KSalup allows Linux users to receive and send popup messages to other computers on a local area network (LAN). KSalup is compatible with many other programs such as Microsoft Winpopup, Kurupop, Linpopup, Salup.
- http://ksalup.sourceforge.net/

QIrc
- A chat client coded using the QT libraries ver. 1.45.
- http://linuxprogs.iwarp.com/en/index_en.htm

KXicq2
- An ICQ client for KDE2.
- http://www.kxicq.org/

KRN
- A KDE Newsreader
- http://krn.sourceforge.net/

KNode
- A newsreader for KDE.
- http://knode.sourceforge.net/

KICQ
- An ICQ (I seek you) client, specifically designed for the KDE desktop.
- http://kicq.sourceforge.net/kicq.shtml

KVIrc
- A free Internet Relay Chat client for UNIX systems with X-Windows.
- http://www.kvirc.net/

KiT - Keep in Touch
- An attempt to create a secure instant messenger.
- http://abelsson.com/kit/

KAM2
- An Answering Machine for KDE2 (ISDN).
- http://www.kpage.de/en/kam2/content.html

KBiff
- KBiff is a "biff" or new mail notification utility.
- http://www.granroth.org/kbiff/