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TCPView - TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on...
pfSense - pfSense is a free and open source firewall and router that also features unified threat management, load balancing, multi WAN, and more
CurrPorts - CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer.
F5 Advanced Firewall Manager - Stop even the most massive and complex DDoS attacks with BIG-IP Advanced Firewall Manager: advanced data center protection against layer 3–4 threats.
TCP Optimizer - SpeedGuide.net - The Broadband Guide. Cable modems, DSL, Wireless, Network security. Free speed tweaks and TCP/IP tools for optimizing system performance.
FireMon - FireMon Security Intelligence Platform delivers continuous visibility into and control over firewall infrastructure.