Wikiquote - A free quote database built collaboratively using Wiki software, a sister project to Wikipedia.
Literal - Track your reading and discover your next favourite book
Quotefancy - Quotefancy is on a mission of turning inspiring quotes into beautiful wallpapers.
Readup - Track and improve your online reading habits.
Brainyquote - Database of quotations by topic or author.
Reading List - Reading List is a read-it-later app by Microsoft, which is bundled in Windows 8.1 onwards.