or Musee de l'Art Moderne de la Ville de Paris, has a wonderful representative collection of the last hundred or so years of mainly French art, especially good on Cubism, such as this Braque:
It mounts special exhibitions (Georg Baserlitz at present), but the permanent collection is free to view. It is housed in the Palais de Tokyo which was built of the 1937 International Exhibition, a favourite haunt of skateboards of all ages; so if you hate art you can grab a coffee and watch the free entertainment - middle-aged men practising tricks and teenagers laughing at them.
An excellent way to spend a few hours on a Sunday and there was hardly anyone there today, unlike the super-crowded Pompidiou. A few more images to give you a feel for what's there: