There are several options for finding legitimate sites to download movies for free. One such site is YouTube, which has a collection of free movies with ads curated by YouTube staff. Another option is Vudu, which offers a selection of free movies with ads as well. Additionally, Tubi has thousands of free movies and shows, including big titles and a kid-friendly area. Classic Cinema Online is another site that offers a selection of classic movies that can be downloaded for free. PopcornFlix is another site that offers a wide range of free films, including blockbusters, genre films, and documentaries. It's important to note that while these sites offer free movie downloads, they may include ads. It is also recommended to consider streaming movies instead of downloading them, as this is often a more legal and safe option.