I have got to admit I canned Spotify subs years ago - but how are they managing to grow their subscriber base whn it is now going to be £11.99 in the UK? That is way, way too high for what it offers...
Not that im aware of, sorry. There is a Windows based spotidown software, but no Linux. Spotidown is a web based service normally, so you could definitely use it in Linux. I actually downloaded all my music from it using my phone!