You sold a property in France? You could be entitled to claim a french tax refund (9,70%) although you would remain liable for the solidarity tax of 7.5%.
You could claim the refund of CSG (9,20%) and CRDS(0,5%) if you have been taxed in France, but are affiliated to a social security system of another EU member state, Switzerland or UK.
More precisely, it is the case for the cross-borders commuters living in France but working in another EU member state, Switzerland or UK.
It is similar for non residents living outside France, working in another state of EU, Switzerland or UK, but having earned income in France (rent or capital gains) subject to social levies.