Odds are you know what's in your PC, like the processor model, how much RAM you've got, and what GPU. But how about when you are trying to troubleshoot your work PC or a relative's. Piriform's Speccy (from the same guys that make CCleaner) is a straightforward solution to find complete specs about your hardware and software in a single place.
First and foremost, why do you need a Wi-Fi information/optimization tool? Although the range of functions varies in the programs listed, they all share a common goal which is to provide the necessary information about the Wi-Fi networks available so you can choose the best options for you.