Updated: 6/12/2004
WinNT

Alert Monitor , 1,514kb: The Alert Monitor is an effective enterprise monitoring tool that monitors your servers to ensure they are up and running. Alert Monitor will check your servers' processes, check that file system space stays within critical bounds, monitor FTP, HTTP, POP, Telnet and SMTP ports, and send emails to the support person if any of the thresholds are exceeded. A general alerter enables you to trap virtually any condition. Monitors Linux, HP-UX, Unisys NX, NT, OSF, AIX and Solaris systems. [Report a dead link]
http://www.freewareplus.com/95docs/server.htm
Analog: Web server analyzer with 27 reports. [Report a dead link]
http://analog.gsp.com/
Basic traffic reporter: Shows reports and graphs of web server usage. [Report a dead link]
http://www.webbizbrokers.com/
Logalyzer: Analyze HTTP logs. [Report a dead link]
http://www.am-soft.ru/
Nessus: Tests your Win NT system for security weaknesses. This is for Unix servers but has a Win 32 client. [Report a dead link]
www.nessus.org
Ping Plotter: Plots time to ping websites in a graph. Very good. There is an older freeware version, and newer shareware version. [Report a dead link]
http://www.nessoft.com/pingplotter/
Proxy+ , 610kb: Proxy+ is a firewall, proxy and mail server that gives the complete solution of shared access to Internet from LAN. Proxy+ runs on a workstation or a server with MS Windows9x/NT and connection to Internet. All workstations can use Proxy+ services by TCP/IP protocol. This version for 3 users is absolutely free. [Report a dead link]
http://www.proxyplus.cz/
ProxyPlus: Freeware proxy server. Freeware version is limited to 2 concurrent users. [Report a dead link]
http://www.proxyplus.cz/en/download.htm
VNC: Allows you to run a VNC server on a Win or unix server, then log in remotely to any PC. It appears you can do remote administration using this free tool. [Report a dead link]
http://www.uk.research.att.com/vnc/faq.html