Serial Port Sniffer is a powerful advanced ActiveX Control that allows your application to sniff (fully monitor and edit data flows) serial port in your system. Serial Port Sniffer ActiveX Control detects all serial port activity in your system, all applications that work with serial port and all the data that is being sent and received can be easily monitored with Serial Port Sniffer ActiveX Control within your own application.

PacketTrap (http://www.PacketTrap.com) Port Scan is a utility that looks for open TCP ports on one or more network nodes. Port Scan may be configured to scan commonly used ports or a custom set of ports as needed. The fast, accurate results are available for export.

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.

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

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.

Advanced Port Scanner is a small, very fast, easy-to-use and robust port scanner for the Win32 platform. It is multithreaded, so on fast machines you can scan ports in very a few seconds. It has descriptions for the common ports and can perform scan on predefined port ranges.

Virtual Serial Port ActiveX Control is a powerful tool for professional developers that allows your application to create custom additional virtual serial port in system and fully control it. Created virtual serial port looks like real serial port for other Windows applications. From your application you can control data sent to virtual serial port by other applications and respond to them by sending own data to virtual serial port.

Virtual Serial Port ActiveX allows your application to create additional virtual serial port in system and fully control it. Created virtual port looks absolutely like a real one for Windows applications. You can view parameters information of a virtual port, set by other application, view and control from your application data sent to virtual port by other applications and respond to them by sending your own serial data to virtual COM port.

Legion Development's LucidScan is a portable multithreaded control based network probing utility. Powerful enough to accurately scan tens of thousands of TCP and UDP ports in minutes while efficient enough on resources to run silently.