SmartSniff allows you to capture TCP/IP packets that pass through your network adapter, and view the captured data as sequence of conversations between clients and servers.

Freeware security configuration utility for Windows. Can close TCP/UDP ports 135, 137-139, 445 and do various other things.

datAxe is a flexible converter to solve all needs between serial data and TCP/IP on Windows computers. datAxe makes serial data from your PC available on TCP/IP networks and makes TCP/IP data available on physical and virtual serial ports of your PC.

HW VSP is a free unlimited virtual serial port driver for Win2000 and XP, redirecting all data from the virtual COM5 (for example) to a predefined IP address. The RFC2217 standards for remote RS232 serial port control are supported.

A network information retriever and diagnostic tool designed to aid in network intelligence gathering and help diagnose network problems.

CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer. In addition, CurrPorts allows you to close unwanted TCP connections, kill the process that opened the ports, and save the ports list to file, and more.

eSTOP! was developed as a security product to view and (e)mergency STOP problem TCP connections. It displays in real-time any TCP connection in or out of your computer. Now with logging and blocking by port, IP address, hostname or domain name.

P-Ping Tools has the most popular function,Such as : scan IP address , scan your TCP/UDP ports , scan several specifically popular TCP/UDP ports .