Tipard YouTube Downloader Mate for Mac combines a video downloader, a video converter and a DVD ripper all in one. With these apps, you can convert your DVD movies into video files and convert them to other formats. Both apps (the DVD ripper and the converter) can be accessed from the main window.
The DVD ripper seems to be very complete. It comes with a small video player, a video editor that lets you trim and crop your videos and adjust brightness and contrast, and support subtitles. There are quite a few different formats supported, including H.264, MPEG-4, FLV, and MOV, among others.
The YouTube converter is basically a video converter without a download feature. This is baffling to me; why would you name an application suite "YouTube Downloader Mate" when you don't include a video downloader. This part of the suite is simply a video converter. It has good format support and average design. It does work well, too.
All in all, this app is a mix of a DVD ripper and a video converter. I honestly didn't find a feature to download videos from YouTube, although it is clearly stated in the main window that the second app allows you to do that.