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

Mobile TCP
Software for forwarding SMTP server connections to the correct SMTP server, made for people traveling with a laptop, connecting to different networks. Automatically checks the network status and detects changes, then by a set of IP/Mask rules Mobile TCP will select witch SMTP server to use. ... Features: Can check either external IP numbers (outside a firewall) or internal, Forwards SMTP connections to the correct SMTP server, Works silently in the background, Easy to copy your current IP numbers to the clipboard, Supports up to 10 simultaneous connections, The Status window shows...
http://www.klocktornet.com/download/MobileTCPSetup_11.exe - 1Mb - Download - Screenshot

Network Traffic Monitor
Network Traffic Monitor shows you which processes in your machine are causing how much TCP/IP network traffic and over which IP ports this traffic takes place. For each process it can show detailed information, including the path to the process executable, the remote IP address, and the... An animated system tray icon will show you when IP traffic is taking place. ... Network Traffic Monitor can give you a historic overview of the network traffic and can save that info to an Excel spreadsheet or a text file for later examination.
http://www.nicocuppen.com/nt.exe - 618Kb - Download - Screenshot

IPTunnelManager
The program IPTunnelManager is used for IP tunneling with the options for compressing and encrypting traffic. Thus, the program makes it possible to create a secure connection for any application or service using TCP/IP (HTTP, FTP, SMTP, POP, NNTP, SNPP, Telnet, etc. ... It is especially important for those TCP/IP services and applications (for example, FTP, Telnet, various DBMS) that transfer passwords openly when establishing a connection between a client and a server. ... IPTunnelManager starts encrypting traffic from the moment when a TCP/IP connection is established, that is why all...
http://www.apbsoft.com/products/iptunnelmng/files/iptunnelmng.zip - 1Mb - Download - Screenshot

Network Serial Port Kit
Network Serial Port Kit allows you to connect any serial port devices over the TCP/IP network or Internet. Creation of local virtual serial ports pairs are available as well. Program creates up to 254 virtual serial ports at a time. Physical COM ports located on remote computer can be connected... For example you can convert usual PC to "Serial Port Server" so then you can connect any serial device directly to a TCP/IP network and communicate with that device from any other PC in the same network or across the Internet.
http://www.network-serial-port.com/network-serial-port-kit.zip - 980Kb - Download - Screenshot

SizePopup
This software allows you sending short texts in computers networks (LAN/WAN). It's similar to the WinPopup, unfortunately win2000 and XP haven't got the WinPopup. Communication is based on a TCP/IP protocol. SizePopup has easy list of users and their IP addresses.
http://www.pool-magic.net/files/SizePopup.exe - 630Kb - Download - Screenshot

Serial Port Redirector
Serial Port Redirector is used to connect a serial application to a remote TCP socket. This allows you to utilize modern hardware COM servers without changing your software or exchange data between a TCP/IP application and an old-fashioned program that can only connect to a serial port. ... With Serial Port Redirector, you can easily control remote hardware COM servers via a TCP/IP network from your serial application designed to work with locally connected devices only. ... Serial Port Redirector creates a two-way bridge between a serial application and a specific TCP port at a specified...
http://www.serial-port-redirector.com/serial-port-redirector.zip - 772Kb - Download - Screenshot

eSTOP
eSTOP! was developed as a security product with the intent to view and (e)mergency STOP problem TCP connections. It displays in real-time any TCP connection in or out of your computer. Web connections are an example of a TCP connection. You can instantly stop that connection by double clicking... Now with logging and blocking by port, IP address, hostname or domain name. ... You can make eSTOP! ... popup whenever connections happen--then do something about those connections! ... complements a firewall because you can use it to stop connections normally permitted by the firewall.
ftp://ftp.nwpsw.com/pub/estop330.zip - 855Kb - Download - Screenshot

PortsLock
PortsLock is a firewall with user-level access controls for Windows NT/2000/XP. Once PortsLock is installed, administrators can assign permissions to TCP/IP connections, just as they would in managing permissions on an NTFS partition of a hard disk. It lets you control which users can access... You can also set allowed/denied TCP/UDP ports and IP addresses for incoming and outgoing connections. ... Users do not have to set up rules in their applications to use the network. ... Only administrators are allowed to set rules so users without administrative privileges cannot bypass the...
http://www.protect-me.com/portslock.zip - 2Mb - Download - Screenshot

Network Configuration Management
Network Configuration Management is a set of utilities that manage network config, diagnose and monitor network, it includes: IP Manager: create different TCP/IP settings profiles, and switch between them instantly without reboot. All you need is just to configure ONCE any of your possible... Socket to Process Mapper: monitors all open TCP and UDP ports in your local computer, and maps ports to owning application so you can find out which program has opened which port. ... And then you just need to select a configuration, IP Manager will instantly switch to it.
http://www.missilesoft.net/downloads/ncm.exe - 4Mb - Download - Screenshot