If you're a big movie fan and use mobiles to watch movies a lot, you will need a movie converter that will convert videos/movies among different formats. * Best Mac app free for video conversion - MacX Video Converter Free If you have QuickTime failure opening certain movies, there we share you the best free Mac apps to play videos on Mac computer. Therefore, watching movies on a Mac shouldn't be quaint or inconvenient. It's a common choice to watch movies or videos on Mac when we're free.