Free port monitoring software for windows

Port Monitor is a free application that was created to help administrator or even regular user monitor port status on selected machines. This application covers 10 Standard ports.
It will monitor your IIS Port, Telnet Port, FTP Port, PC Anywhere, SQL, NetBIOS, POP, IMAP, DNS, and SMTP. Just type in the machine name or IP Address that you want to monitor, select the port and click on the Add button.
Once you are finished with adding the machines that you wish to monitor, then click on the monitor button to have the application monitor those selected machines and or ports.

TCP Properties Monitor is a small monitoring application that shows real time the ports activity.
TCP Properties Monitor was developed for the LandlordBG.co.uk and is free.

ITA Monitor will immediately notify if mission-critical services such as World Wide Web Publishing Service, Simple Mail Transfer Protocol (SMTP), SharePoint Portal Server service, Exchange Server Services and more have failed.
Other applications monitor ports remotely but this application is unique and more efficient since ITA Monitor gets instant event driven information directly from the operating system the moment service status changes and is able to notify you promptly.
ITA Monitor is a very efficient and light weight application. After installation, simply select the services that need monitoring and enter the cell-phones or email addresses that should receive alerts when a service goes down, restarts, or comes up.
With ITA Monitor, youll always know the status of critical Windows Services, no matter where you are. ITA Monitor is a utility that all Microsoft Windows Administrators will find it extremely useful.

A graphical application that monitors TCP/IP ports on remote servers and/or device status using ICMP ping. Microsoft Agent Technology has been integrated into the program to provide audio and visual alerts when device or TCP/IP port connectivity has been lost. Requires Microsoft Agent 2.0 and the Merlin Character.