From Eltima Software:
Airy is a YouTube video downloader, i.e. an application that allows you to save your favorite YouTube videos so you can watch them whenever you feel like - no matter whether you are connected to Internet or not and whether it is still available on the web site. It can download complete playlists with the possibility to download each item in the available quality and supports YouTube channels. When you log in to your YouTube account you can save age-restricted and protected YouTube videos to your computer. The application is capable of handling Full HD and 8K Ultra HD video download without hiccups.
Apart from just downloading YouTube videos, Airy allows you to choose a required format and resolution; formats supported include MP4, FLV and 3GP. It also lets you extract and save only soundtracks - all you have to do is to choose MP3 from the list of the formats displayed when downloading. The app will fetch album art & titles from the files. You can resume paused or interrupted downloads and set up event notifications for your convenience.