GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
Startup Stash - A curated directory of 400 resources & tools for startups
Goodreads - See what your friends are reading.
Makerbook - A directory of the best free resources for creatives
LibraryThing - A home for your books.
Freebiesjedi - Discover & download useful freebies everyday