= FMRIB Software Library software (FSL) = [[http://www.fmrib.ox.ac.uk/fsl|FSL]] is a package for analysis of FMRI, structural, and diffusion data. FSL is written by the [[http://www.fmrib.ox.ac.uk/analysis|image analysis group]] at the Oxford centre for [[http://www.fmrib.ox.ac.uk|Functional Magnetic Resonance Imaging of the Brain]]. The package is mostly C or C++ with a Tcl/Tk GUI, and has a dual license - open source and free for academic use, but commercial use requires a paid license.