Eltima Serial Port Terminal is an ideal tool for testing, debugging and troubleshooting serial port devices. It lets you work with numerous number of ports simultaneously, both serial and virtual ones. You can easily alter baudrate, databits, parity, stop bits, flow control parameters and dynamically apply these changes to serial port settings on the go. You can always check for history of typed commands.

Serial Port ActiveX Control is a powerful component that lets developers quickly and effectively work with serial port. Use Serial Port component to easily communicate with external devices on RS232 connection, such as modems, bar code readers, PBX and so on. Serial Port introduces several extremely useful properties for detailed setting of serial port, numerous methods to write and read from port and events to control serial port state changes.

Create and manage virtual serial ports from .NET and Visual Basic (ActiveX)
Using Virtual Serial Port SDK you can create a "new" serial port on your computer. This serial port is completely controlled by your application. Other 3rd party applications can connect to this serial port and believe it is a normal serial port.
Windows Mobile/Pocket PC, Windows XP/2k/NT and Windows ME/98.
Samples in C#, VB.NET and VB6

This tool pings a list of servers on a specified port at a user-defined interval. It's good for ensuring that SQL Servers are up and running (just point it at port 1433) or for keeping an eye on your web server (port 80, generally).

SRedirect is a command line utility that allows a remote TCP/IP connection to a serial port. SRedirect redirects all RS-232 data from a TCP/IP port to and from the local serial port. SRedirect creates a server for ONE local serial communications (COM) port. SRedirect allows connection of a client application. SRedirect transfers data in both directions between the connected client and the local COM port.

Advanced Port Scanner is a small, very fast, robust and easy-to-use Port Scanner for Windows. Powered with multithread scan technology, Advanced Port Scanner can scan hundreds of ports in just a few seconds! Also, it contains descriptions for common ports, and can perform scans on predefined port ranges.

1st Ip Port Scanner is a very useful Ip Scanner and Port Scanner. It builds ip finder port finder ip scanner port scanner and ip tracer ip tracker ip camera in one software. It can find ip address,search ip address,trace ip address and scan ip address.And it also can find port,search port and scan port.It is easy and fast!
1st Ip Port Scanner allows for testing whether a remote computer is alive with three types ICMP, SYN and UDP.

Free Port Scanner is a small, fast, easy-to-use and robust port scanner for the Win32 platform.You can scan ports on fast machines in a few seconds and can perform scan on predefined port ranges. This tool uses TCP packets to determine available hosts and open ports, service associated with port and other important characteristics. The tool is designed with a user-friendly interface and is easy to use.

Scanmetender Standard is a multifunctional TCP/UDP network scanner and security suite, which unites a perfect graphical user interface (GUI) with professional functions. Scanmetender Standard is not only able to scan ports, but also to close them! It is probably the best choice if you search a port scanner.

See which ports belong to which programs! Port Explorer shows all the open ports on your system and what programs own them. Along with this ability it also has many tools including a packet sniffer, bandwidth throttling and country detection to name just a few. Port Explorer has an intuitive GUI that allows you to quickly see all your network activity, and thanks to its ease of use is allowing people everywhere to do advanced network activities.