Resources
Thousands of Free eBooks for Summer Reading!

Zing 
is a service that offers thousands of free fiction and non-fiction ebooks. On Zing you can browse for books by topic, language, or reading level. You can read the books in your web browser on a laptop or tablet.

If you are looking for short articles instead of ebooks, take a look at ReadWorks.  The reading packs are a great option for students looking for relatively short articles.