IMDb - Internet Movie Database
Peepflix - Social platform for movie lovers to know what friends are watching.
TMDB - free movie database
Letterboxd - Letterboxd is a social site for sharing your taste in film, now in public beta.
WMM - Search Your Favorite Movie And TVShow With Biggest Database
Metacritic - Metacritic aggregates music, game, tv, and movie reviews from the leading critics. Only Metacritic.com uses METASCORES, which let you know at a glance how each item was reviewed.