Here is a list of websites that I find useful when creating lesson plans.
Planboard
Better Lesson
PlanBook
A to Z Teacher
Lesson Planet
The Wonder of Science
Discovery Education
Share My Lesson
Busy Teacher
Jumpstart
Math Drills
ead write think
scholastic
teaching resources
get epic
illuminations
share my lesson
lesson planet
class craft
teacher created
national geographic
learning for justice
teach primary
pbs learning media
better lesson