PortMarshaller 

PortMarshaller is a software-based TCP/IP port forwarder. The software accepts connections on a particular TCP port, and establishes connections to a different TCP port to fulfill requests.
tcp/ip port forwarder

TCP Spy 

TCP Spy captures and displays all socket calls that an application makes and the data that is sent and received on the application's sockets. TCP Spy will work with any type of application.
tcp/ip view examine sniffer packet monitor socket winsock

sMonitor 

Monitors networked devices and TCP/IP services running on them. Allows to ping hosts and check TCP and UDP ports. Shows a current status, sends notifications by email, generates log, HTML and CSV files and executes custom scripts. Run as NT service.
internet tcp/ip udp icmp nt service network monitoring servers services hosts ports ping

VisualPulse Web Edition 

VisualPulse enables 24x7 Web-based monitoring of Web pages, servers and network nodes, reporting Ping, HTTP, SNMP, and TCP performance and easy-access Web-based reports. Provides automated alerts and traceroute capture for problem analysis.
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NetworkView 

NetworkView is a compact network discovery and management tool for the Win32 platform : in a few minutes, it will discover all TCP/IP nodes and draw a full graphical map using DNS, MAC addresses, SNMP, WMI, NetBIOS and TCP Ports information.
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A1Monitor Network Monitor TCP or Web 

Monitor multiple web or TCP servers (http, https, ftp, pop3 etc.) Receive email notification by email or pager if any can't be reached a number of times in a row
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