Free - Paessler AG

Reliable network and website monitoring. Sensor types include PING, PORT, HTTP, HTTPS, HTTP Advanced, HTTP Transaction, DNS, SMTP, POP3, FTP, SNMP, as well as various native Windows system sensors and native SQL sensors for MS SQL, MySQL and Oracle.
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Free - AdventNet Inc.

ManageEngine OpManager is a comprehensive, easy to use Network, Systems and Applications monitoring software that offers integrated fault and performance management functionality.
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Free - Paessler AG

IPCheck Mobile GUI offers reliable network and website monitoring through your PocketPC. Sensor types include PING, PORT, HTTP, HTTPS, Advanced HTTP, HTTP Transaction, DNS, SMTP, POP3, SNMP and custom.
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$24.95 - Nessoft, LLC

MultiPing is an application built for monitoring graphically one or more TCP/ IP hosts, while providing detailed historical insight about the collection period to monitor uptime and performance or to just keep track of general connectivity.
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