haaa inspecteur Gadget, i've watched tons of episodes when i was younger because it was on the French TV back then.
a true cult classic, would recommend.
https://www.youtube.com/watch?v=itwBlZ_lTVg
but it wasn't the only French "anime", there was "Les mystérieuses cités d'or", "Ulysses 31" and many more.
and yes it is "anime" because it was animated in Japan by Japanese studios (but with French help) BUT; to my knowledge, those anime were never distributed in Japan because they were "bought" like the animation mainly, not the story, VA's, etc...
maybe Japs did see inspector Gadget on their TV but i don't think it happened and the character design for Penny is most likely Japanese but i doubt it's the case for Uncle Gadget himself.
pic rel is Ulysse 31, another Franco-Japanese production with the designs and animation clearly Japanese.
i'd love to see a "new" Franco-Jap production, a remaster, for Ulysse 31.
and by the way, the most modern French-Japanese production i can think of is Radiant, it's a French manga that got a Japanese anime adaptation with Japanese VA's this time (and french VA obviously) and broadcasted in both countries.