FreePortScanner
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... The tool is designed with a user-friendly interface and is easy to use.
http://www.nsauditor.com/freeware/downloads/FreePortScanner.exe - 518Kb - Download - Screenshot

Fast Port Scanner
Fast Port Scanner is a fast multithreaded port scanner that scans about 400 ports a second. It supports both the TCP/IP and UDP protocols. You can select address ranges to scan multiple interfaces or hosts. Any open ports will have the any suspect Trojans listed with it. ... This program is free when using Global Up Time website monitoring service.
http://www.globalwebmonitor.com/software/FastScannerSetup.exe - 636Kb - Download - Screenshot

ITS Net Serial Driver (ITSNSD)
While the operation of different facilities, which are connected to a computer via serial port, there may appear the necessity to start up utility program (for these facilities) not in the machine, to which the facilities connect directly, but in the remote machine, that is connected to the... IP address of the receiving server, port number and the number of the real serial port on the receiver are specified on the client for each port. ... ITSNSD server is a service which realizes the exchange between a real driver of the serial port and TCP/IP.
http://www.itsuperiority.com/downloads/products/avsdnet.zip - 576Kb - Download - Screenshot

HiFlyTechNet Serial Driver (HNSD)
While the operation of different facilities, which are connected to a computer via serial port, there may appear the necessity to start up utility program (for these facilities) not in the machine, to which the facilities connect directly, but in the remote machine, that is connected to the... IP address of the receiving server, port number and the number of the real serial port on the receiver are specified on the client for each port. ... HNSD server is a service which realizes the exchange between a real driver of the serial port and TCP/IP.
http://www.hiflytech.com/downloads/products/avsdnet.zip - 576Kb - Download - Screenshot

Alarit Net Serial Driver (ANSD)
While the operation of different facilities, which are connected to a computer via serial port, there may appear the necessity to start up utility program (for these facilities) not in the machine, to which the facilities connect directly, but in the remote machine, that is connected to the... IP address of the receiving server, port number and the number of the real serial port on the receiver are specified on the client for each port. ... ANSD server is a service which realizes the exchange between a real driver of the serial port and TCP/IP.
http://www.alarit.com/downloads/products/ansd.zip - 283Kb - Download - Screenshot

EXP Net Serial Driver (ENSD)
While the operation of different facilities, which are connected to a computer via serial port, there may appear the necessity to start up utility program (for these facilities) not in the machine, to which the facilities connect directly, but in the remote machine, that is connected to the... IP address of the receiving server, port number and the number of the real serial port on the receiver are specified on the client for each port. ... ENSD server is a service which realizes the exchange between a real driver of the serial port and TCP/IP.
http://www.explorinform.com/downloads/products/avsdnet.zip - 576Kb - Download - Screenshot

AlarIT Virtual Serial Driver .IP (AVSD.IP)
While the operation of different facilities, which are connected to a computer via serial port, there may appear the necessity to start up utility program (for these facilities) not in the machine, to which the facilities connect directly, but in the remote machine, that is connected to the... IP address of the receiving server, port number and the number of the real serial port on the receiver are specified on the client for each port. ... IP server is a service which realizes the exchange between a real driver of the serial port and TCP/IP.
http://www.alarit.com/downloads/products/avsdnet.zip - 576Kb - Download - Screenshot

SkPortScan ActiveX Control
SkPortScan ActiveX Control is a lightweight and powerful port scanner control. It allows developers to integrate port-scanning capabilities into their applications. SkPortScan can be used for network exploration or security auditing. SkPortScan can determine what services (ports) are open... It can operate in 3 different scan modes: - Scan range of ports; - Scan authorized ports only (authorized port numbers are divided into three ranges: the Well Known Ports, the Registered Ports, and the Dynamic and/or Private Ports.
http://www.magnetosoft.com/downloads/skportscan_setup.exe - 2Mb - Download - Screenshot

PortMarshaller
PortMarshaller is a software-based TCP/IP port forwarder and network monitoring service. The software accepts connections on a particular TCP port, and establishes connections to a different TCP port to fulfill requests. This capability offers a solution to various network topology problems. ... Optionally integrates with Internet Information Services (IIS) for its advanced abilities. ... Administrative web interface allows the monitoring of connection and data transfer statistics.
http://www.portmarshaller.com/portmarshaller.zip - 303Kb - Download - Screenshot

Multicom.Net
While the operation of different facilities, which are connected to a computer via serial port, there may appear the necessity to start up utility program (for these facilities) not in the machine, to which the facilities connect directly, but in the remote machine, that is connected to the... Net server is a service which realizes the exchange between a real driver of the serial port and TCP/IP. ... The use of our product gives you the possibility to give the remote access to serial port via TCP/IP.
http://www.intellidriver.com/downloads/products/multicomnet.zip - 283Kb - Download