TCP Port Toolkit is a protocol, data, and timing analyzer.
List available hosts, open ports, and their characteristics.
B&W Port Scanner is a program that will scan your TCP ports.
The Eclipse Foundation
The Eclipse has a well earned reputation for providing quality software.
Named Pipe TCP Proxy - utility which provides access to named pipes on Windows.
HW Virtual Serial Port allows creating virual serial port drivers.
Monitor open TCP and UDP ports and applications that open them on your PC.
The dialer uses one local UDP port and one local TCP port.
NetworkActiv AUTAPF is a UDP and TCP port forwarder.
A multi-threaded and fast TCP port scanner.
A powerful connect-based TCP port scanner, pinger and hostname resolver. Multithreaded and asynchron....
Send an ICMP packet (ping) to a device, connect to a required TCP port.
This tool is handy if you encountered unexpected TCP port conflict exceptions.
Flachmann & Heggelbacher
Establishes TCP connections, accepts a TCP connection on a local port, etc.
TCP/IP port redirector with many features for the advanced user.
Knocker is a simple and easy to use TCP security port scanner.
Coral Works, Inc.
Software-based TCP/IP port forwarder and network administration service.