Freeware: Udp

CurrPorts 1.31CurrPorts displays the list of all currently opened TCP/IP and udp ports on your local computer.In addition, CurrPorts allows you to close unwanted TCP connections, kill the process that opened the ports, and save the ports list to file, and more.

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Comm Echo 1.0.0.29Comm Echo is a free debug tool for serial port (RS232), TCP/IP and udp port communication. It's for loop back test. It displays all received data in Text, Hex or Decimal format. It lists all available serial port on computer automatically.

Comm Tunnel 1.0.0.29Comm Tunnel is a free tool to connect two endpoints. It builds a tunnel between two endpoints. The endpoints can be any of serial port, TCP/IP server, TCP/IP client or udp . The data received on one endpoint will be forward to anther endpoint.

ServerTalk 1.0ServerTalk is an application that allows you to communicate directly with an open TCP or udp port on a machine. It is similar to a graphical Telnet client, but lets you pick the port, and lets you use TCP or udp .

3proxy tiny proxy server 0.5.3hUniversal proxy server with HTTP, HTTPS, SOCKS v4, SOCKS v4a, SOCKS v5, FTP, udp and TCP portmapping, access control, bandwith control, traffic limitation and accounting based on username, client IP, target IP, day time, day of week, etc.

Active PortsActive Ports - easy to use tool for Windows NT/2000/XP that enables you to monitor all open TCP/IP and udp ports on the local computer. Active Ports maps ports to the owning application so you can watch which process has opened which port.

RemoteNetstat 1.0Remote Network Statistics displays remote network computer IP, ICMP, TCP, udp and Server statistics, shows the details about IP datagrams including forwarding enabled-disabled state , default time to live, the number of received datagrams, datagrams

Hercules SETUP 2.7.3Hercules SETUP is useful utility including terminal for the Serial port (RS232 or RS485), udp/IP and TCP/IP (Client or Server). Implemented Serial Terminal works with the Virtual Serial Ports, and controls all serial port lines.

TrafficEmulator 1.4Nsasoft Network Traffic Emulator generates IP/ICMP/TCP/udp traffic from clients to server to stress test servers, routers and firewalls under heavy network load. It is a very simple and fast program which can simulate client activity.

OstroSoft Winsock Component 2.0COM library for Visual Basic 6, providing an easy access to the network layer of operating system ( udp and TCP sockets). OSWINSCK.

Scanmetender Standard 3.0Scanmetender Standard is a multifunctional TCP/udp network scanner and security suite, which unites a perfect graphical user interface (GUI) with professional functions. Scanmetender Standard is not only able to scan ports, but also to close them!

DiamondCS OpenPorts 1.0DiamondCS OpenPorts is a freeware CLI (command line interface/console) tool that allows you to see all open TCP and udp ports on your system, including the owner process.

Seconfig XP 1.1Seconfig XP can configure Windows not to use TCP/IP as transport protocol for NetBIOS, SMB and RPC, thus leaving TCP/udp ports 135, 137-139 and 445 (the most exploited Windows networking weak points) closed.

PacketViewer 1.2.3263Easy program to sniff and view IP packets (TCP, udp , ICMP). PacketViewer allows you to view IP packet messages and IP packet informations in real time. You can easily listen on Windows system ports (Eg. Ports 135, 445, 1026-1028).

Attacker v2.1is a TCP/udp port listener which can notify you of any attempted probes to your computer via the Internet.

TCPView v1.0shows you a detailed view of all TCP and udp endpoints on your system. The display also includes the remote address and the state of the TCP connections.

Microsoft Bonk Security Fix for WinNT 2.4\prevents Windows NT from hanging when sent deliberately corrupted udp packets. This behavior occurs due to a variation of the "teardrop&quot\; attack.

StreamEdit 1.0b2\Intercept &amp\; modify TCP or udp streams. StreamEdit is a utility that allows you to modify a TCP 'stream' or udp datagrams. It does this by tunnelling the data through itself and then allow you to edit it arbitrarly or use real-time filters.

PacketViewer 1.3.3557Easy program to sniff and view IP packets (TCP, udp , ICMP). PacketViewer allows you to view IP packet messages and IP packet informations in real time. You can easily listen on Windows system ports (Eg. Ports 135, 445, 1026-1028).

Comm Operator Pal 1.4.0.117Comm Operator Pal is a free tool to test and debug device or application that communicated with RS232, TCP/IP or udp . It supports data in Text, Decimal and Hex format. Data can be sent in list automatically. Single data can be sent repeatedly.

365TCPView 2.0A Windows program that will show you detailed listings of all TCP and udp endpoints on your system, including the local and remote addresses and state of TCP connections.convenient for viewing.

World Wide PC Remote ( wwpcremote ) 1.3Remotely control your PC using your iPhone. Things you can control include: - Devantech USB relays, - Hardware and software that react to udp messaging, - waking up, restarting and shutting down PCs connected to yours.

P2P VoIp 1.1The program is used for conversation in a local network. The voice packages are transmitted in a format GSM6.10. Voice packages and service information use one and the same udp port. The program is distributed with the source code.

AdapterWatch 1.02displays useful information about your network adapters.

Kiwi Logger 2.0Kiwi Logger (KLOG) is a free suite of syslog message sending tools for Windows. The tools allow you to add syslog message sending capabilities, via udp or TCP, to your applications. The syslog messages can be received by Kiwi Syslog Daemon

3proxy 0.5.3jUniversal proxy server with HTTP, HTTPS, SOCKS v4, SOCKS v4a, SOCKS v5, FTP, POP3, udp and TCP portmapping, access control, bandwith control, traffic limitation and accounting based on username, client IP, target IP, day time, day of week, etc.

Active Wall Traffic Monitor 2.0Active Wall Traffic Monitor is a free real time network traffic monitor software for LAN. It can monitor more than 1,000 computers at the same time. It displays speed, packets, bytes of each computer and provides traffic statistics, net flow.

Wake-on-LAN Packet Sniffer 1.1Wake-on-LAN Packet sniffer is designed to troubleshoot and setup Wake-on-LAN entire your Network. It allows to check whether the target machine recieve the packet. Program will display all incoming "Magic Packets".

TheOne SysLog Sender Free Edition 2.5.0TheOne Syslog Sender Free Edition is a free syslog tool. It can simulate networking device such as router, firewall and servers to send TCP and udp syslog message to syslog server.

Kiwi's Syslog Daemon v6.2.1 betaallows you to receive, log, display, and forward Unix-type Syslog messages. Kiwils Syslog Daemon can receive standard Syslog messages on udp port 514, which can be sent from routers, switches, or Unix hosts, and displays the details on the screen.