The networks below for watching movies and TV series are legal, stable, and will likely to be available for years to come.
Crackle
Crackle is perhaps the best-known free streaming TV and movie service. Sponsored by Sony, Crackle boasts TV shows and movies from the 80s through the 00s. You'll also find newer films on it sometimes, as well as bit of original content such as StartUp, a dark show about technology companies. Call it organized crime 2.0. It's a hidden gem of a show with actors such as Martin Freedman, Ronald Perlman, and Adam Brody. Give Crackle and StartUp a try.
FilmRise
For another good free VoD network check out FilmRise. Its movies tend to be more obscure, but it offers a good selection of popular TV shows such as Third Rock from the Sun, Cybill, and Roseanne.
The Roku Channel
The Roku Channel borrows free movies and TV shows from other streaming networks and its own free content. It offers a mix of older and current TV shows and films.
Tubi TV
TubI TV is one of the better free VoD services. It comes with perhaps the biggest video library, with 7,000 titles. That's thanks to its access to Lionsgate, MGM, Paramount Pictures, and Starz Digital's libraries.
Vudu
Vudu offers free movies and shows, with commercials. These are usually older shows (21 Jump Street and WildFire) and movies (National Lampoon Vacation, Gods of Egypt). But, for free, what's to argue with?
Xumo
If you're a golfer, you'll like that Xumo is the first network to carry the PGA Tour' new streaming channel. One nice feature is that as it learns what shows you like and offers you selections it believes you'll want to watch.