Secondary STEM resources

This page is a list of free (as in no payment required) resources for teaching STEM topics at the primary level (ages 12-18). Some may be under non-free licences.

Science Net Links
Free lessons from the American Academic for the Advancement of Science. http://sciencenetlinks.com/lessons/

NASA
Public domain educational resources from NASA. https://www.nasa.gov/education/resources

Bootstrap
Full curricula in using programming to learn, algebra, data science, physics, etc. http://www.bootstrapworld.org/materials/spring2018/

Hacking STEM Library
Lower secondary (middle school) library of activities from Microsoft Education. https://www.microsoft.com/en-us/education/education-workshop/activity-library.aspx

NRICH - enriching mathematics
Activities for enriching maths learning by the University of Cambridge. https://nrich.maths.org/

Also has resources for primary school students.