Box

Box

Amazon Kindle

Amazon Mobile LLC

Audible: audiobooks & podcasts

Audible, Inc

Epic: Kids' Books & Reading

Epic! Creations Inc

Libby, by OverDrive

OverDrive, Inc.

ThriftBooks: New & Used Books

Thrift Books Global, LLC.

Bookshelf

Vital Source Technologies

Barnes & Noble NOOK

Barnes & Noble

Goodreads

Goodreads