Mass Tube is a small software utility designed to help users grab their favourite video files from YouTube in the easiest way possible.It is a simple-to-use tool built specifically with a single goal in mind: to grab video files from YouTube, so it doesn’t pack other useful features such as a built-in search engine and audio files downloader. MassTube can work with multiple output formats and the video files can be exported to FLV, MP4, WebM and 3GP.