Amblingbooks
This pay site offers a selection of free teen titles, mostly classics.
BookBub
This site alerts you to limited-time free & discounted ebooks matching your interests. You can read on any device, and the books are yours to own.
Books Should Be Free
A collection of classics in audio and ebook. Includes titles like Anne of Green Gables, Swiss Family Robinson, Little Women, and Sherlock Holmes.
Epubbooks
There is a large selection of free YA titles and stories on this commercial site.
Goodreads
This popular book review site offers about 100 free ebooks, mostly classics and reading list titles.
Smashwords
Free original ebooks. You can also publish YOUR OWN writing on this site.
Wattpad
Wattpad holds over 75 million fan fiction stories for you to read online or off. Read and share your own stories with fans across the world!