Starfall
ABCya
Between the Lions
Readquarium
Reading is Fundamental 
Practice Reading or Learn English
Vocabulary Practice
International Digital Library 
Storyline Online
TumbleBooks
New York Public Library: Ebooks
FunBrain
We Give Books
NoveList K-8
Read to Me
Story Nory
Barnes and Noble: Online Storytime
Oxford Owl
Britannica School Elementary 
Britannica Learning Zones
Big Universe
NewsELA
News articles that can be changed by lexile levels