We wanted to put together a meta list like this but of course it has been already been done. Checkout Ranker.com who have a list of lists of indie flicks:
The Best Movies of All Time
What to Watch Again and Again
Must-Sees from Decades Past
Feel-Good Films
Guilty Pleasures
Funniest Movies
Adventures Films
Four Stars from Roger Ebert
100% Approval on Rotten Tomatoes
Top Film Franchises
Chick Flicks
Crime Movies
Movies for Guys
Superhero Movies
Revenge Flicks
Rainy Day Movies
The Greatest Movies of the 2010s, Ranked
Best Biopics About Real People
Great Very Long Movies
Directed by Women