There are many quality lesson plan websites and teachers will need to decide whether or not modification of someone else's lesson plan is necessary. That supports the "art" and "science" of teaching. That being said, here are some resources for you to consider as you plan your next unit or a lesson. The websites are free, searchable by curriculum, and printable.
- Read Write Think from the Verizon Foundation
Thinkfinity from the Verizon Foundation
Scholastic's Lesson Plans - Lessons for K-12 and adult education