HandBrake - HandBrake allows users to easily convert video files into a wide variety of different formats.
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.
dmMediaConverter - FFmpeg GUI
Format Factory - Format Factory is software that allows the user to convert media into various file formats. The software is a product of PC Free Time, a Chinese software development company. Read more about Format Factory.
FFmpeg - Open source multimedia suite for conversion, playback, profiling, and streaming.
Elasty - Creaceed makes innovative apps for iPhone, iPad, and Mac in the field of document scanning and OCR, note taking, and photography.