TVGuide.com - Download the app USA Today calls “invaluable” and Time lists as one of 50 Must-Have Apps.
Filmsomniac - Filmsomniac.com | TV Tracker | Movie Tracker
TV Show Tracker - Manage your TV shows on phone or tablet - seasons, details, casts and much more!
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
DroidShows - TV series browser and tracker
Trakt.tv - Automatically track TV shows & movies you're watching.