We have data acquired in *.fdf format but unable to visualize it via typical visualizing software/toolbox like we can do for fMRI data. Please suggest me the toolbox, software or converter to visualize this data.
I assume that FDF files are data acquired on an Agilent/Varian scanner? If so, mrTools (https://github.com/justingardner/mrTools) contains a routine (fdf2nifti.m) for converting FDF files to NIFTI files. mrTools is a Matlab based fMRI analysis package. If you do a bit of Googling I think you can find other similar converters as well.