http://www.readwritethink.org/ - Providing educators and students access to the highest quality practices and resources in reading and language arts instruction.
http://www.proteacher.net/ - A professional community and web directory for teachers in grades PreK-8.This site includes free lesson plans and discussions for elementary and middle school.
https://www.teachingchannel.org/ - Teaching Channel is a video showcase of inspiring and effective teaching practices in America's schools. It includes sample Common Core video lessons and ideas in all subject areas and grade levels.
www.learnzillion.com - LearnZillion is a free learning platform that combines video lessons, assessments, and progress reporting. Each lesson highlights a Common Core standard, in either Math or Language Arts.
http://www.wegivebooks.org/ - Free online books for students age 0-10. Every time someone reads a book on this website a book is donated to a needy child.
http://larryferlazzo.edublogs.org/ - Daily websites that are designed for ELL learners in the classroom.