Bookling - Track your reading habits and set goals
GoodBooks.io - Largest curated collection of 8,500+ book recommendations.
Literal - Track your reading and discover your next favourite book
Bookicious - Find the best new book to read with books collections for makers, founders and entrepreneurs.
Reading List - Reading List is a read-it-later app by Microsoft, which is bundled in Windows 8.1 onwards.
Oku - Track your book lists and get recs from your friends