Especially good for math and computing for all ages but other subjects at Secondary level. Note this uses the U.S. grade system but it’s mostly common material.
Free to access 100s of courses, only pay to upgrade if you need a certificate in your name (own account from age 14+ but younger learners can use a parent account).
Free taster courses aimed at those considering Open University but everyone can access it. Adult level, but some e.g. nature and environment courses could well be of interest to young people.
Learn computer programming skills – fun and free.
Creative computer programming
All sorts of engaging educational videos
Activities and quizzes for younger kids
Learn languages for free
Free science lessons
Wide range of cool educational videos
You Tube videos on many subjects
As above for a younger audience
Science awards you can complete from home
All kinds of making
Good for elementary school ages
Aimed at Secondary age, multi disciplinary activities
Geography gaming!
Good, free art activities linked to from this Facebook page
Easy arts and crafts for little ones
Creative art and craft activities for the very youngest
Educational online games