Monitors event log, services, performance counters, disk space, web pages, etc.
BSEditor: PA 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. Also includes rich reporting on most monitored resources.

PA Server Monitor can watch:
-Event logs on local and remote Windows servers
-CPU and Memory Usage
-Free local and server disk space
-Changed files and directories (great intrusion detection)
-Running Windows services
-Custom script results
-Local and remote directory quota monitoring
-Network Interface Card (NIC) usage
-Performance Counter values with threshold warnings
-POP, IMAP and SMTP Mail Server availability status
-Web page content and load times
-Ping response times
-Server temperature you can free download PA Server Monitor 3.6.6.5 now.