The Association for Library Services for Children has several wonderful book lists available online, including a Kindness book list and Summer Reading Lists for preschool through 8th grade.
TumbleBookLibrary is an online collection of  animated, talking picture books.  Access at home, in the library, at school-- anywhere!
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We now subscribe to Scholastic BookFlix! 
Geared to 3-7 year olds, this site pairs interactive picture books with non-fiction books.  There are also games to play!
Access on your computer or mobile device with your library card.