usbtop is a top-like utility that shows an estimated instantaneous bandwidth on USB buses and devices.
Current stable release is 1.0 (tag release-1.0).
The project is stable and has been tested on debian systems. It should work on all different flavors of Linux though. Do not hesitate to report any issue you would have while trying to compile and run usbtop.
A ncurses and Qt interfaces with a Windows port are the next steps. Feel free to contribute :)
Please refer to the INSTALL.md file for installation instructions.
Then, you need to have the usbmon module loaded. As root, do :
# modprobe usbmon
Moreover, on some distributions, usbtop need to be run as root!