Tiny Message 

Tiny Message is a program allowing you to send network messages as fast as possible. Using of it will be very comfortable if you have your own recent recipient list. In that case you can set your shortcuts once and then just use it.
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WinPopup Speak! 

WinPopup Speak is free add-on for Fomine WinPopup. This application speaks incoming messages that received by Fomine WinPopup.
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QuickMessenger 

QuickMessenger is a simple tool that provides an enhanced interface for Instant Messenging and allows you to send text messages from one computer to the other or to a group of computers (on the LAN).
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Natural Born Chatter 

Popular text chat solution that was designed specifically for small and medium local area networks. It doesn't require an Internet connection or a dedicated server, because it utilizes your network, enabling your staff to communicate effectively
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VSL LanToucher Network Messenger 

LanToucher is a full-featured, Microsoft WinPopup-compatible LAN messenger for Microsoft Windows 95/98/NT4/2000/ME/XP/Server 2003. Designed as a WinPopup and "net send" replacement, LanToucher provides many more functions, options and features.
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Fomine WinPopup 

Fomine WinPopup is an instant-messaging tool for all versions of the Windows. Fomine WinPopup full support for Winpopup and 'net send' (Windows components).
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