libusb-sys is used at run time in 23 crates (of which 3 optionally). It is a direct run-time dependency in 2 crates. It's used only as a dev dependency in 1 crate.

Depender (with downloads and own rev deps) libusb-sys version
1.6K 20 libusb ^0.2.3
libdc1394-sys ^0.2