libusb is an open-source userland USB API/library that enables an application to access USB devices. libusb has been implemented for a number of operating environments, including Linux, BSD, MacOS, and Windows, as well as for Oracle Solaris and Sun Ray environments.

libusb applications can run on any operating environment that supports libusb. For further information, see /usr/sfw/share/doc/libusb/libusb.txt or the libusbut man page.

There are some open source applications that make use of libusb support and enable users to access devices, such as the SANE project (http://www.sane-project.org/) for scanners. To find more open source applications, see http://sourceforge.net.