Tubi: Expansive Selection, No Subscription
Tubi is a powerful streaming service that has an extensive catalog of more than 40,000 movies and television shows that are completely free to access with ads. It has a partnership with substantial studios such as MGM and Paramount, offers quality streaming on all the main platforms, and does not need any registration, so it is the best option when a person wants to receive diversity without being charged in advance.
Stremio: Open Source Media Hub
Stremio is a free and open-source streaming application that integrates official and community add-ons such as movies, series and online channels. It allows casting to TV, subtitle downloading, and can run on most of the larger operating systems, providing the user with plenty of flexible viewing choices without commercials or subscriptions.
Pluto TV and Freevee: Live and On-Demand Variety
Pluto TV focuses on free, ad-supported on-demand and live television programming, replicating the cable experience, by having more on-demand offerings. Amazon-owned Freevee provides free content in the form of movie and TV shows, as well as some Prime Video originals, but viewers will see advertisements.
Other Notable Mentions
Redbox, Crackle, Kanopy, Filmzie, Plex, and Popcornflix are all ad-supported streamers with varying content libraries so you have more free entertainment options to use instead of Amazon Prime Video.