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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Net Events 

Workstations monitoring with customizable reactions to certain events. There is periodical event checking with reacting to event occurence. Each workstation can have unlimited events and each event can have unlimited reactions.
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NetStatus Professional 

NetStatus Pro is a monitoring application designed to monitor anywhere from 1 to 250 servers or devices on a network. Tests include HTTP, FTP, Telnet, Ping, Disk Space, Event Log, File Exists, NT Service Status, Performance Monitor and more.
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Fomine NetSend 

Fomine NetSend is a package that contains two utility tools for sending messages via SMB protocol. This first tool NetSend.exe is a console application. The second utility tool NetSendGUI.exe has a simple and user-friendly visual interface.
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Messenger Service SPAM Filter 

Get rid of the Messenger Service spam without disabling the service. Messenger Service Spam Filter processes pop-up messages and shows/hides messages based on the user defined keywords and rules.
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Ip-Harvester 

Ip-Harvester can send popups by Windows messenger service.
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