Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Video DownloadHelper - Browser extension to download videos from the Web
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
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…
ClipGrab - A friendly downloader for YouTube and other sites
yt-dlp - A youtube-dl fork with additional features and fixes.
Freemake Video Downloader - Freemake Video Downloader downloads videos from more than 10,000 sites. Absolutely FREE. Download YouTube in HD, MP4, MP3. **Voted best of 2018**.