Zbit J-Chat Pro 

The J-Chat Pro is fast, reliable, scalable, fully customizable and easy to install chat application without page flickering. Hosts multiple sites, private rooms, and moderated chats. Private messages, ignore, kick, ban and abusive words.
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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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Quick Notes Plus 

Create skinnable Sticky Notes on windows desktop. Set alarms to each note, arrange notes inside memoboards to avoid desktop clutter. Send notes over network or as email. Stick notes to documents and websites. Skins are downloadable.
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Mihov Mail Sender 

Mihov Mail Sender sends the same message to more people - but it displays only their name as recipient, so they will think this mail is ment only for them. Great for invitatitions (i.e. to birthday parties...) and keeping privacy!
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LetUknow 

LetUknow provides a "peace of mind" method of monitoring your LAN and resources. You can specify numerous jobs and tests in advance on a "set and forget" basis, which LetUknow then runs at regular intervals
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SystemView 

Network Monitoring, Send Message, Shutdown manager, Process manager, Reports, Remote Desktop Management, Inventory Management, Internet History, File History, Security management.Agentless management works both on workgroup and domain
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