These are some websites that we find useful and hope you will as well.
Goodreads - A good place to keep track of your books, find new books from your favorite authors, and get recommendations from other readers.
KDL What's Next - Great database for book series, whether you just want to look up the next book or find a complete list. Search screen is similar to a library catalog.
rivetedlit.com - For Young Adult fiction
Drivers Education - A place to find practice exams and more
IXL.com - Tutoring/homework help