MyAnimeList - Start cataloging anime you've watched or manga you've read.
GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
AniList - AniList is a tool to track and record your progression in anime and manga, featuring multiple...
Goodreads - See what your friends are reading.
Kitsu - Kitsu is the easiest way to track, share and discover new anime and manga.
LibraryThing - A home for your books.