FFQueue - FFQueue is a FREE and comprehensive GUI for the FFMpeg command line encoder: Convert audio and video from everything to everything!
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.
WinFF - GUI frontend for FFmpeg.
XnConvert - XnConvert is an easy image converter for graphic files, photos and images available on Windows...
SoundConverter - The sound conversion application for the GNOME environment.
Elasty - Creaceed makes innovative apps for iPhone, iPad, and Mac in the field of document scanning and OCR, note taking, and photography.