jstest gtk - mdeguzis/RetroRig GitHub Wiki
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About jstest-gtk
jstest-gtk is a simple joystick tester based on Gtk+. It provides you with a list of attached joysticks, a way to display which buttons and axis are pressed, a way to remap axis and buttons and a way to calibrate your joystick.
Even when your joystick is working mostly fine, you might want to give it a try, as the calibration lets you get rid of overlarge default deadzones that many joysticks use and that are a a noticable problem in some games.
jstest-gtk is covered under the GPLv3.