MessagePal 

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
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Group OfficeView 

Lan IN/OUT board with automatic In and Out posting. Personalized remarks allowed. It also includes a messaging system and a screen that displays employee information.
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Able OfficeView Pro 

Lan IN/OUT board with automatic In and Out posting. Personalized remarks allowed. It also includes a messaging system and a screen that displays employee information. Awarded 5 stars by ZDNet.
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1 - Instant OfficeView 

Lan IN/OUT board with automatic In and Out posting. Personalized remarks allowed. It also includes a messaging system and displays who is actively using their workstation. No administration required. Board is updated instantly.
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NetChat 

NetChat is a peer-to-peer local network messaging and communications system for Windows which does not require a server to be running for use. It allows you to chat in real-time with other users on a secure and private local network connection.
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IntraChat 

IntraChat is a messaging software application that facilitates effective real-time communication via computer networks. It does not require a dedicated server or Internet access and can be used by anybody. Download your free trial version now!
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