Active Ports

Active Ports is a simple Windows application designed to display all open TCP/IP and UDP ports, helping you not only to view the existing network connections, but also detect malicious files that may run on your system.
Although this kind of programs is usually addressed to more experienced users, anyone can use Active Ports, mostly because it's only focused on serving a single purpose: show UDP and TCP connections.
The interface is the thing that makes everything easy as pie, relying on a well-organized layout with all the details displayed right in the main window.
You can thus see the connection type, TCP or UDP, local IP, local port, remote IP and port, state, protocol and path, which means you can easily identify a process that's running on your computer, but also the machine/IP it is connected to.
Additionally, Active Ports sports a dedicated feature to terminate a given process straight from the main window, so you don't need to launch Windows' Task Manager for this particular task.
Of course, it should come as no surprise that Active Ports works on low resources and doesn't stress up the machine at all, but there seem to be some compatibility issues with Windows 7. Active Ports fails to launch and there's no way to make it work on this version of the operating system.
All things considered, Active Ports is a very simple application that serves its purpose very easy, without hampering computer performance at all. With a few improvements in some key areas, such as interface and number of features, it could easily become a top utility for a handful of users out there.