This site offers an interesting way to discover new books to read, review books, create your own library of books you own, and curate a timeline of books read.
BookLikes
Science Fiction & Fantasy Stack Exchange
This site is a question and answer site for science fiction and fantasy enthusiasts. It's 100% free, no registration required.
A List of Books
With over 600 books listed from several Top 100 Books lists, I'm wondering how many of these books have you read?
Awful Library Books
A compendium of awful library books still gracing the shelves of libraries.
Hit Record
HitRecord is an online collaborative production company founded and owned by actor and director Joseph Gordon-Levitt. The company uses a variety of media to produce such projects as short films, books, and DVDs
Google Lab’s Ngram Viewer
An addicting tool that lets you search for words and ideas in a database of 5 million books from across centuries
Music Theory
This site offers not only introductory and intermediate music theory lessons, but also ear trainers and books.
Robin Reads
This site offers free and discount kindle books daily.
Can I Delete Kindle Books?
Is it safe to delete Kindle books from your ereader.
The Public Domain Review
This site is an online journal showcasing works which have entered the public domain.