Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Xilisoft Video Converter - Xilisoft Video Converter is easy, fast, reliable, and loaded with features.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Savemp3 - Savemp3 is an online video converter and downloader that supports videos from YouTube, Facebook, Instagram, Soundcloud music, Twitter, Reddit, Vimeo, and Dailymotion.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
Prism Video Converter - Prism Video Converter is a simple and easy2use converter for converting all audio and video formats including MP4, AVI, MPEG, MOV, FLV and tons of others.