2021 Edition.
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>>3817795*List of archived threads:
https://pastebin.com/TXKE0xAT*Unofficial /c/ discord server of and for cute things:
https://discord.gg/7BHZ5Ju*The Ricchan archive, contains DL links for the K-ON! Illustration archives, the けいおん! Live Concerts, Sato Satomi's discography, Ritsu's Image songs in FLAC, and the official Keion desktop app (calendar widget, desktop mascots, system sounds changer, clock widget, cursor changer and a wallpaper manager):
https://mega.nz/#F!WsBWhATa!pkf8TUBIsdChuh02DZ0_qA*Anon's vector project:
https://mega.nz/#F!IoZR1S5K!PURHPUos2YtdOxIGRJaoiw*Need help finding sauce on a particular image?
Try these, which can lead you to even more Ritsu:
>yandex (can find source even if the sample image is cropped)https://yandex.com/images/>saucenao (links to boorus as well as the pixiv ID if any)https://saucenao.com/index.php*Need help organizing your collection of Ritsu?
>https://hydrusnetwork.github.io/hydrus/