calibre - Ebook manager, viewer & converter
Wattpad - Wattpad is now the worlds most popular ebook community where readers and writers discover, share...
FBReader - FBReader is an e-book reader for various platforms. Features:
Medium - Welcome to Medium, a place to read, write, and interact with the stories that matter most to you.
Google Play Books - Google Play Books lets you search, preview, and buy millions of books using Google Book Search.
Fanfiction.net - The most popular fan fiction website in the world according to Wikipedia