A commandline downloader for YouTube videos and playlists (and not comments). Also works for a surprising number of other websites.
It has no competition, so I guess I can say that it'll have to do, but it really is good.
youtube-comment-scraper for comments.
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|1.||^||was www.arrakis.es/~rggi3/youtube-dl/ (archive) then rg3.github.io/youtube-dl/|
TODO - make a proper page