Greasy Fork is available in English.
Download YouTube videos. Video formats are listed at the top of the watch page. Video links are tagged so that they can be downloaded easily.
MP4 360p - signature fails.
Signature detection has changed. It should be working with v2.07.
Broken
Check this - https://www.youtube.com/watch?v=CevxZvSJLk8
Does not work.