For keeping a portable film library and creating film clips, HandBrake is an essential DVD conversion program. While creating a vast film library of .mp4 files might take some time and space up front, having those films ready at any time is especially helpful for bringing in examples from other films without having to constantly switch discs. Likewise, creating .mp4 files allows editing in order to create shorter film clips, which is immensely helpful in presentations. While this is not necessarily an essential program for everyone, the features are certainly worth checking out for Mac users.