I have linked to
Molen Magazine before, but since it's all written
in Dutch or Flemish its most frustrating seeing the information there, but not being able to understand it, so I've not revisited
for a while. (There are occasional English "translations" provided for small sections, but these are obviously machine generated,
and generally as impenetrable as the original language).
On a recent visit however, I notice that they have newly added "databases" of
mills in Belgium and France.
These databases are rather strange in that they are provided as numerous pages via a photo hosting service, which unfortunately
means there is no apparent way to search the "database", but browsing brings with it its own pleasures. There are separate pages for
post mills, complete tower mills, ruined or converted windmills, and watermills, within each of the regions covered.
Also of interest for browsing on the site are the
Old postcards pages.
Molen Magazine databases of Belgium and French mills