xfer9860 works with the fx-9860G (AKA Graph85) versions of Casio's graphing calculators. It allows you to transfer files to your calculator, and works on platforms where libusb is available - including Linux and Windows.
This is an inteface for the data acquisition cable for the UNI-T (Uni-trend) UT61D multimeter. It supports both USB (using libusb) and RS232 cables. The interface consists of a single C header file.
A userspace USB peripheral driver for the Owon range of digital storage oscilloscopes. Based on the libUSB library it is aimed at Linux but also portable across platforms.
User space driver to log data from PICO ADC 11/12 for Linux/Mac.
...It has been tested on Linux 32 and 64 and on Mac OS X based on Fink project.
You find more information about PICO ADC 11/12 here http://www.picotech.com/discontinued/USB-ADC-11.html.
This little driver is based on libusb-0.1 (legacy API) which you can find here http://www.libusb.org.