From 4Media Software Studio:
4Media Download YouTube Video is completely free to help you download YouTube FLV, MP4, and Webm videos from YouTube.com and save them on your hard disk. This FREE YouTube video downloader can drag and drop to download YouTube videos from YouTube super fast, or use the Internet Explorer's right-click menu option to directly download videos, or even download YouTube videos in the built-in browser. Even YouTube HD videos, even 1080p HD video and 4k video. Download 3D videos can be supported.
What's new in this version:
In version 18.104.22.16840331, you can simply save the downloaded YouTube videos.