This program does exactly what its name implies: identifies who is connected to your Wi-Fi network. The application might prove to be of good use to system administrators who wish to identify if any unauthorized users have connected to their network.
Who's On My WiFi comes with a user-friendly interface, so you don't need to be a professional computer user in order to use it on your Mac. The utility immediately scans your network and displays a list containing info about all of the connected machines and devices.
You can learn the IP and MAC addresses of the connected devices, edit the details of the machines (mark them as Laptops, Tablets, etc.), and use the integrated search tool to immediately find items within the scan results list.
Another great thing about this program is the fact that you can configure it to run scans at any interval of time you like. You can also enable or disable automatic scanning for certain networks.
Unfortunately, the app occasionally fails to identify the manufacturer info of a connected device. In my testing, 2 out of the 15 found devices showed the "Unknown" message for the Manufacturer field.
In conclusion, Who's On My WiFi is an efficient and easy-to-use monitoring utility for Mac. It immediately scans your network, provides you with accurate info, and is free.