Nrich Maths:
https://nrich.maths.org/
Pacific Institute for the Mathematical Sciences:
http://www.mathtube.org/
Vi Hart:http://vihart.com/
https://www.youtube.com/user/Vihart
Plus Maths:
https://plus.maths.org/content/
Numberphile:
https://www.youtube.com/user/numberphile
YouCubed:
https://www.youcubed.org/tasks/
Math Science Music:
https://mathsciencemusic.org/
ESPN Sport Science:
http://www.espn.com/espn/sportscience/index
Teach It Maths:
https://www.teachitmaths.co.uk/investigations
Dan Meyer’s 3-Act Math:
https://docs.google.com/spreadsheets/d/1jXSt_CoDzyDFeJimZxnhgwOVsWkTQEsfqouLWNNC6Z4/pub?output=html
Math Factor Podcast:
https://itunes.apple.com/gb/podcast/the-math-factor/id81854832
Yummy Maths:
http://www.yummymath.com/
NASA – Explore Space Through Math
https://www.nasa.gov/audience/foreducators/exploringmath/home/
Qedcat:
https://www.qedcat.com/
Mathematical Intelligencer:
http://www.springer.com/mathematics/journal/283
Math in the Movies:
https://www.qedcat.com/moviemath/
Wolfram Alpha:
https://www.wolframalpha.com/