port of the X Window System server to Windows. It shares the same source code base as Cygwin/X, but does not depend on the Cygwin environment or cygwin1.dll. Xming is a fully featured X11 server for Windows that is very simple to install and use.
an application that lets you monitor TCP and UDP activity on your local system. It a powerful tool for tracking down network-related configuration problems and analyzing application network usage.
a collection of utilities and technical information related to Windows internals by Mark Russinovich and Bryce Cogswell. Microsoft acquired Sysinternals in July, 2006.
a simple client and server to allow the forwarding of Lan packets over the Internet or in an intranet network. It was made to play multiplayer games with no direct IP connection when players are not in the same local network
combines Comodo's sturdy firewall and state-of-the-art antivirus protection in one suite. Defends your PC against 1 billion executables including viruses, root kits, Trojans, and zero-day attacks. And even with all these great features, CIS is free. Users are also asked to install the Comodo SafeSearch and Ask.com toolbars, so be careful.