Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
Freemake Video Converter - Freemake Video Converter Converts 500+ Formats & Gadgets FREE! Convert to MP4, AVI, MKV, WMV, DVD, Xvid. FREE Download. **Voted Best of 2018** Comes with FREE…
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
HandBrake - HandBrake allows users to easily convert video files into a wide variety of different formats.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.
FFmpeg - Open source multimedia suite for conversion, playback, profiling, and streaming.