en.wikipedia.org
en.wikipedia.org is a reference page with background information, context, and related sources.
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openlibrary.org
Open Library is an open, editable library catalog building toward a web page for every book ever published. Users can read, borrow and discover more than 3M books for free, and contribute corrections and new information like Wikipedia. It also provides APIs for book discovery and lookup services.
rate.house
rate.house is a collaborative media database for rating and tracking albums, songs, movies, TV shows, literature, games and podcasts in one place. Users can create and browse lists and tags, and add recommendations. It is described as resembling IMDb or Goodreads with more media types, and as collaborative like Wikipedia.