TCP Optimizer
TCP Optimizer is a free, easy to use Windows program that helps tune and optimize your Internet connection. The program can help bothe the novice and advanced user chang related TCP/IP Registry parameters, such as the TCP Receive Window, MTU, even QoS and ToS/Diffserv prioritizatioin. ... There is no installation required, just download and run.
http://www.speedguide.net/files/TCPOptimizer.exe - 596Kb - Download - Screenshot

TCP IP Quick Guide
A "Must have" quick reference for IT/Networking professionals and students who are learning and using TCP/IP; Comprehensive Protocol Map focus on TCP/IP protocol suite and key layer 1 and 2 LAN, WAN an MAN protocols; Detailed explanations of IPv4 and IPv6; IPv4 and IPv6 addressing schemes; IPv4... 25 in x 11 in paper size for easy printing and use as a portable reference.
http://www.javvin.com/product/tcpipguide-demo.zip - 49Kb - Download - Screenshot

TCP Viewer
TCP Viewer captures and displays all data that is transferred between client processes and a server process communicating through TCP/IP. The processes can be running on the same machine or different machines located anywhere on a network or the Internet. ... TCP Viewer can be used by a developer to debug protocol problems or by anyone who is curious about what data is passed between processes. ... TCP Viewer can run on a machine different than the machine(s) that the processes are running on. ... An example of a client and server is a web browser and web server.
http://www.westbrooksoftware.com/tcpviewer.zip - 500Kb - Download - Screenshot

TCP Spy
When TCP Spy's Start button is pressed, it will capture and display all socket calls of the next application that starts and makes a socket call. It will also capture and display the data that is sent and received on the application's sockets. The application can be of any type. ... Else, TCP Spy will show the message in hexadecimal and ASCII. ... If a message contains only text, TCP Spy will display it as such. ... TCP Spy displays its output in a scrollable text box. ... When you register TCP Spy, you will be sent a code that enables the additional features.
http://www.westbrooksoftware.com/tcpspy.zip - 565Kb - Download - Screenshot

XP TCP/IP Repair
Is Spyware and/or Adware messing up your internet connection after you have uninstalled it? Has your internet connection slowed down and you just don't know why? Have you used an Internet Optimizer that just didn't optimize your internet, instead it made it slower? ... XP TCP/IP Repair is a Graphical User Interface (GUI) for commands in Windows XP that repair your TCP/IP registry settings and your Winsock LSP's. ... Layered Service Providers (LSP) are small pieces of software that can be added or inserted into the Windows TCP/IP handler by other software.
http://www.xp-smoker.com/downloads/xptcprep.exe - 463Kb - 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

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... 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

Bill Redirect Serial-File-TCP Port & KB
Resident Tray System software for barcode scanner or other serial data capture devices that have a standard RS232 serial interface / file and or TCP Ethernet connection. The program will redirect file/serial/TCP Port and keyboard buffer to any direction. ... , Can send a answer to TCP and or Serial Port; perfect to control protocol ! ... Possibility to control MULTI-PORT (Serial/TCP Ethernet) ! ... Simply the best redirect software available ! ... Redirects inputs (data) to any applications (POS, database, Excel, Word, or your own customized the software).
http://www.symcod.com/BillSerial_KB/Bill_COMtoKB.zip - 3Mb - Download - Screenshot

Network Mechanic
Network Mechanic optimizes your Internet connection up to 300%, providing faster download speeds and fewer delays while browsing. Network Mechanic modifies a wide series of parameters that control how your TCP/IP stack operates. Such parameters as packet size, receive and transmit window sizes,... Now with the help of our program you can optimize TCP/IP protocol according to your opportunities of network without a studying all bases TCP/IP networks. ... It acts as an accelerator for your network connection.
http://www.benutec.com/download/networkmechanic_trial.exe - 663Kb - Download - Screenshot

MyMappeR
TCP Mapped Port with firewall. Load at Windows start up and autostart functions added. Complete log statistic will be saved for any Internet activity. Very easy-to-use and Doesn't require installation. Can be used to map your POP3 or FTP connections for purposes of antivirus software update. ... Of course any other TCP connection can be mapped too. ... Runs on system tray as a small icon near the clock.
http://members.fortunecity.com/myeraser/downloads/my_mapper1212.zip - 292Kb - Download - Screenshot