USB Tree is described as 'Free and open-source utility for when you're trying to see what USB devices are connected to which of your USB ports, when you want to find out what speeds they're running at, or you're diagnosing any USB device related issues' and is an app in the os & utilities category. There are three alternatives to USB Tree for Windows, Android and F-Droid. The best USB Tree alternative is USB Descriptor Explorer for Android, which is both free and Open Source. Other great apps like USB Tree are USBDeview and USB Device Tree Viewer (UsbTreeView).