dmMediaConverter - FFmpeg GUI
HandBrake - HandBrake allows users to easily convert video files into a wide variety of different formats.
AppleMacSoft DRM Video Converter - Convert iTunes M4V to MP4 on Mac
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321Soft Video Converter for Mac - 321Soft Mac Video Converter allows you to easily download, convert and edit video, HD video, 4K video, audio on Mac OS X.
File Converter - Convert & compress everything in 2 clicks!