Fun Size Physics:
https://funsizephysics.com/

Seeker:
https://www.youtube.com/channel/UCzWQYUVCpZqtN93H8RR44Qw

Minute Physics:
https://www.youtube.com/user/minutephysics

Veritasium:
https://www.youtube.com/user/1veritasium

Mathologer:
https://www.youtube.com/watch?v=YuIIjLr6vUA

Kurzgesagt – In a Nutshell
https://www.youtube.com/channel/UCsXVk37bltHxD1rDPwtNM8Q

Smarter Every Day:
https://www.youtube.com/user/destinws2

Vihart:
https://www.youtube.com/user/Vihart

Physics Tutorials:
https://www.physicsclassroom.com/Physics-Tutorial

APS Physics Central:
Physics in Action, Physics in Pictures, Physics +, Physics@Home, and more
http://www.physicscentral.com

OSA’s Optics for Kids website:
Activities, Celebrities, Timelines, and more
http://www.optics4kids.org/home/

IOP Physics.org:
http://www.physics.org

NASA Outreach Resources:
http://science.nasa.gov/researchers/education-public-outreach/

Expanding your Horizons Network: 
http://www.eyhn.org/aboutmain

International Particle Physics Outreach Group:
http://ippog.org/resources/types/activities