Simple Server Monitor
Simple Server Monitor is a powerful, yet easy to use server monitoring utility. It allows you to monitor the status of your servers and web applications from your desktop. Simple Server Monitor runs as a notification icon and you will be unaware that it is running - until a monitor fails. ... Simple Server Monitor also supports performance monitoring by charting the monitor response time and by logging (optional) all monitor queries to a log file and/or the event log. ... When a monitor fails, you are notified by a pop-up message and/or an e-mail alert.
http://www.simpleservermonitor.com/files/setup.exe - 4Mb - Download - Screenshot

PA Server Monitor
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...
http://www.poweradmin.com/servermonitor/servermonitorpro.exe - 5Mb - Download - Screenshot

Alchemy Network Monitor
Alchemy Network Monitor monitors your network servers and business-critical applications availability and performance and immediately alerts you if a server gets out of order. Alchemy Network Monitor can also perform certain actions (e. g. launch an external application or execute an SQL query)...
http://www.mishelpers.com/ftp/netmon.zip?c=archive - 2Mb - Download - Screenshot

Alchemy Network Monitor PRO
Alchemy Network Monitor monitors your network servers and business-critical applications availability and performance and immediately alerts you if a server gets out of order. Alchemy Network Monitor can also perform certain actions (e. g. launch an external application or execute an SQL query)...
http://www.mishelpers.com/ftp/netmonpro.zip?c=archive - 3Mb - Download - Screenshot

DEKSI Network Monitor
DEKSI Network Monitor is an advanced, powerful, and feature rich tool that monitors servers located on your local network and the Internet. DEKSI Network Monitor will allow the Administrator to increase the reliability and productivity of your corporate servers. ... The program can be installed on any Windows 95, NT, 2000, XP, Server 2003 machine and can monitor the servers with any operating system (Windows, Linux, Unix, etc. ... Using DEKSI Network Monitor the Administrator is aware about the state of their servers at any time.
http://www.deksoftware.com/new/dnm.exe - 2Mb - Download - Screenshot

NTP Server Monitor
TimeTools NTP Server Monitor is a free software utility that runs on any Windows platform, workstation or server. It allows any number of NTP time servers to be constantly monitored. Any servers that are operating outside of pre-set tolerances are highlighted. ... It can also, optionally, synchronise system time with the optimal time server reference.
http://www.timetools.co.uk/ntp-servers/ntp-server-monitor.zip - 64Kb - Download - Screenshot

Easy Network Service Monitor
Easy Service Monitor is a network fault management tool that continuously monitors network devices and services. If something went wrong, it will alert you by email/phone/pager BEFORE problems get seriously out of hand. A detailed log file will record every event of the monitored targets and can... You can configure the system so that when something goes wrong, a set of actions, such as execute a program, reboot server or update web page, will be triggered.
http://www.javvin.com/emonitor.exe - 2Mb - Download - Screenshot

GFI Network Server Monitor
GFI Network Server Monitor automatically monitors the network & servers for failures. It allows you to identify issues and fix unexpected conditions before your users (or managers) report them to you! Alerts can be sent by email, pager or SMS, for instant problem notification. ... GFI Network Server Monitor tests the status of a service by actually logging on, testing and logging off, rather than deducing a service status from generated events (as other products do), which is the only real way to ensure server uptime!
http://software.gfi.com/networkservermonitor7.exe - 13Mb - Download - Screenshot

ServerSweep Professional
ServerSweep Professional has been designed from the ground up by experienced Microsoft Windows NT / 2000 Server support engineers and consultants to provide the very best in Microsoft Server Monitoring. ServerSweep Professional has been optimised to allow you to monitor almost every aspect of... Net Server, without the need to install any client software on the monitored server itself. ... ServerSweep offers a rich set of monitoring options including: System Overview, TCP/IP, Services, Processes, SNMP, Event Log, Performance, URL, Disk Space and Custom Tests.
http://www.blue-square-software.com/pages/Trial/downloaddetails.htm - 16Mb - Download - Screenshot

HSLAB HTTP Monitor
Real-time performance monitoring solution for Apache servers. HSLAB HTTP Monitor is a handy real-time performance monitoring and statistics analysis software application for Apache servers, which are used ubiquitously in the web hosting industry. Basically, with HSLAB monitoring system... That is the server running on Apache may be located thousands of miles away, while the program (HSLAB HTTP Monitor) could be installed on home or office PC and the system administrator will always have access to server?
http://www.sys-monitoring.com/downloads/hslab-http-monitor.exe - 3Mb - Download - Screenshot