CONV. - Convert YouTube video to MP3, GIF or MP4
Fast Video Cataloger - Digital asset management - search, browse and find all your digital files. A new quick and easy way to organize your video clips without wasting time.
Downie - Video download for OS X. Downie supports at this moment over 1,000 different sites.
Video Hub App - The fastest way to browse, search, and manage videos on your computer. Like YouTube for videos on your computer!
Yout - YouTube to Mp3 Converter
Progetto Video Manager - PVM is a performer centric software to manage your clips, movies, TV series and pictures collection.