If you would like to convert a file from one format to another, you can do so using ConKit’s provided script, which is called conkit-convert.
$> conkit-convert toxd/toxd.mat ccmpred toxd/toxd.rr casprr
The call above converts the toxd.mat file, which is in ccmpred format, to the toxd.rr file in casprr format.
You can convert these files to many different other formats, for a full list check out the Table of available file formats.