Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Bizdownloader - Bizdownloader is Video Downloader website from top social networking websites like Youtube...
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Transcoder - Transcoder is a free command-line-based video converter that allows you to convert any size of video into a range of audio and video formats.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
Wondershare UniConverter - Wondershare UniConverter (originally Wondershare Video Converter Ultimate) can convert any video to over 1000 formats at 30X faster speed without quality loss, burn DVD, compress/edit/download/record videos, transfer files to devices.