CD Messenger: Office Instant Messenger
CD Messenger is a highly advanced workplace-centric office communication tool. Now you can communicate with your office colleagues right across the hallway or across the globe in an environment that is fully secure, stable and reliable. The aim of CD Mess

HipChat
HipChat is instant messaging built for business. No ads, obscure screen names, or failed file transfers. Collaborate in real-time with colleagues and clients in persistent ...

qutIM
qutIM is an open-source multiprotocol ( ICQ, Jabber / GTalk / FaceBook / Ya.Online / LiveJournal, Mail.Ru, IRC ) instant messenger.

KVIrc - Szymon Stefanek and The KVIrc Development Team
KVIrc is a free IRC client based on the Qt GUI toolkit.

AutoTweet
AutoTweet is a small and easy to use application that allows you to automatically send tweets directly from your computer at a given time interval.

sobees
Connect all your Twitter accounts and enjoy the most powerful Twitter client on your Windows computer.

TwitHaven - Holy Mackerel Software
TwitHaven is a handy application which helps the users to sent short internal messages and attachments.

eNotice
eNotice is new bulk messaging solution allowing instant and reliable delivery of notifications, messages and alerts across any networks to Windows Desktops, Cell Phone as ...

BuddyTalk
BuddyTalk is a small, Java based application, specially designed to offer you an instant messenger.

Beyluxe Messenger
Beyluxe Messenger is an instant messaging service that you can use to talk with people from all over the world.

Beyluxe Answer Machine
Beyluxe Answer Machine is a small and easy to use application that will help you setup custom messages to be displayed when you`re away from ...

Nimbuzz - Nimbuzz
Using multiple instant messengers at the same time is one of the latest trends so many users can now chat on Google Talk, Yahoo Messenger ...

DMDirc - Chris Smith
DMDirc is developed as a cross-platform and user-friendly IRC (Internet Relay Chat) client written in Java.

Kadu
Kadu is a simple, easy to use application specially designed to offer you a gadu-gadu protocol instant messenger client.

CCO Playground Client
CCO Playground Client is a voice chat client that will enable you to chat with your friends with the greatest ease.

Softros LAN Messenger - Softros Systems Inc
Is your company starting to experience communication problems? Does it take too much time to call your co-workers to invite them to a group meeting?

JFBChat
JFBChat was developed as a small, simple and Java-based software application specially designed to offer you a Facebook chat client.

Vacuum-IM
Vacuum-IM is a useful application that was designed to provide you with a simple means of getting in touch with your friends.

ChatStage
Chat to up to 100 of your friends in a conference room, share files, chat 1 on 1!

Mumble - Thorvald Natvig
Mumble was designed as a low-latency, high-quality voice communication for gamers.

NumberMe
Do you want to chat on internet with the feeling that your message will not be read only by the person to who it's dedicated? ...

TwitMee
TwitMee is an extremely simplistic and lightweight Twitter Client. No fancy graphics and complicated settings, only send status updates. Just type and click.

Instantbird - Florian Quèze and Quentin Castier
Instantbird is a multi-protocol Instant Messaging client. Using it, you can connect to all your different IM accounts.It uses the Mozilla rendering engine to display ...

Active Messenger
Active Messenger was designed to be a powerful instant messaging product, similar to MSN. It includes a server and a client and provides user with chat features.