Just to add to the list of online resources, here are a couple of mine. First is a general
guide to flying to France, but I have also set up a web page that plots French airfields (and ULM strips) onto a Google maps view of the country. Just click on the symbols to get links to Nav2000, the SIA plates, the airfield web site (where I could find one), and thumbnail sketches of those fields that I've been to.
The map page is
here.
I set it up as an exercise to teach myself the Google maps API and I can't guarantee it to be free of errors, but it does give quite a useful overview of where airfields are when you're planning a trip.