The National Science Teachers Association is perhaps the best resource for science teachers of all levels. There is so much information and so many useful tools for science teachers that you will need several days to process all the material.
The website is incredibly organized. There are resources for different grade levels and groups including elementary school, middle school, high school, and college. Teachers can also  use the “choose to interact section” that includes social networking and NSTA Learning Center. Whatever category applies to you, I am sure you will find what you need.
The NSTA’s Mission: “ … to promote excellence and innovation in science teaching and learning for all.”

The webpage also has many other great sections including:
About NSTA
Member Services
Professional Development
Conferences and Institutes
Publications and Products
Exhibits and Advertising
Get Involved
Science store
Science teachers, school leaders, and parents can also connect with the National Science Teachers Association. Below is the account information.
@NSTA The National Science Teachers Association: promoting excellence and innovation in science teaching and learning for all. Arlington, Virginia · (10,100+ followers)
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