There are some (or old blogs) but afaik none with a library big enough that it's more convenient than just googling "<anime> + download". Pretty sure the big direct DL sites you could use for most of what you wanted got purged off the web long, long ago.
It's easier to find stuff on streaming/video sites and try to grab it using either youtube-dl or finding a direct link to the video file using inspect element/page info/etc. I do this when I can't find a torrent. But the quality is usually not great.