Easy Network Service Monitor 

Easy to use and low cost tool for network, applications and services monitoring, fault identification, notification and reporting as well as service level agreement monitoring and reporting.
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ServiceKeeper 

Administration, Monitoring and Recovery of any networked resources (Windows Services, TCP/IP Services, web servers, routers, file systems, Process memory and CPU usage, Event Log, ...) and notifcation in case of downtime (email, SMS, phone call, ...)
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ServiceMill 

Run securely your application without the need of a user session Run most executable: 16 bit (Dos, Windows, OS/2 1.x), 32 bit and batch files, Java Run custom applications developed using: Visual Basic, PowerBuilder, Delphi, etc. and more
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Server Monitor 

Server Monitor is a Windows service that monitors the health and availability of Windows servers, network services (on Windows, Linux and other operating systems), and devices. No agents are needed to monitor remote servers.
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