MyAnimeList - Start cataloging anime you've watched or manga you've read.
AniList - AniList is a tool to track and record your progression in anime and manga, featuring multiple...
Kitsu - Kitsu is the easiest way to track, share and discover new anime and manga.
SeenTh.at - An online community where users discuss, recommend and discover movies, as well as organize lists...
AniDB - AniDB is a non-profit anime database providing you with all information regarding anime.
Anime-Planet - Anime and manga database, recommendations, reviews and more!