MovieLens - MovieLens helps you find non-commercial, personalized movie recommendations.

Letterboxd - Letterboxd is a social site for sharing your taste in film, now in public beta.

IMDb - Internet Movie Database

Criticker - The independent movie, TV and board game recommendation engine and community.

Simkl - Simkl is a TV, anime, and movie tracker that keeps a history of all the shows and movies you watch in one, central location. It’s a mobile app, a website, Google Chrome extension to keep track of everything you watch and integrates with many TV apps

Trakt.tv - Automatically track TV shows & movies you're watching.