1)   ChatMan 1.5
ChatMan provides an universal solution for communicating within local area network (intranet). ChatMan perfectly combines higly customizeable interface (color styles, text aliases, addons) and ease of use (once installed it is ready to use)
Chat, LAN, ChatMan, chatting, net, talks, local, secure, universal, meeting,

 2)   MessagePal 1.6.3
MessagePal provides simple, secure, instant messaging between users on your LAN without a server or Internet connection. Group lists, 1-click Replies, Message Forwarding, and many more unique features!!! http://www.messagepal.com
office messaging, instant messenger, instant messaging, office communication, messaging, phone message, IM, instant, reply buttons, message buttons,

 3)   Der Feine Herr (DFH) 0.8.5
The electronic "bulletin board" for your team management. Server-less with P2P technology. Automatic synchronisation updates the data on all Feinen Herrn running - keeping every team member up-to-date. Forget notepads - take Der Feine Herr!
Bulletinboard, P2P, Team Management, Serverless, Messages, Teammessenger, Update, Synchronization, Automatic, Easy to use,