These are mainly in English, and from the UK or the US. I found this list and the descriptors on a teaching group on Facebook, so cannot personally vouch for how good the content is on all of them:
A non-exhaustive list that might help those affected by school closures due to coronavirus, compiled by home educators.
Feel free to share.
Khan Academy
Especially good for maths 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.
BBC Learning
http://www.bbc.co.uk/learning/coursesearch/
This site is old and no longer updated and yet there’s so much still available, from language learning to BBC Bitesize for revision. No TV license required except for content on BBC iPlayer.
Futurelearn
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).
Seneca Koop
https://www.senecalearning.com
For those revising at GCSE or A level. Tons of free revision content. Paid access to higher level material.
Openlearn
https://www.open.edu/openlearn/
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.
Blockly
Learn computer programming skills – fun and free.
Scratch
https://scratch.mit.edu/explore/projects/games/
Creative computer programming
Ted Ed
All sorts of engaging educational videos
National Geographic Kids
https://www.natgeokids.com/uk/
Activities and quizzes for younger kids.
Duolingo
Learn languages for free. Web or app.
Mystery Science
Free science lessons
The Kids Should See This
https://thekidshouldseethis.com
Wide range of cool educational videos
Crash Course
You Tube videos on many subjects
Crash Course Kids
https://m.youtube.com/user/crashcoursekids
As above for a younger audience
Crest Awards
Science awards you can complete from home.
iDEA Awards
Digital enterprise award scheme you can complete online.
Paw Print Badges
https://www.pawprintbadges.co.uk
Free challenge packs and other downloads. Many activities can be completed indoors. Badges cost but are optional.
Tinkercad
All kinds of making.
Prodigy Maths
Is in U.S. grades, but good for UK Primary age.
Cbeebies Radio
https://www.bbc.co.uk/cbeebies/radio
Listening activities for the younger ones.
Nature Detectives
https://naturedetectives.woodlandtrust.org.uk/naturedetectives/
A lot of these can be done in a garden, or if you can get to a remote forest location!
British Council
https://www.britishcouncil.org/school-resources/find
Resources for English language learning
Oxford Owl for Home
https://www.oxfordowl.co.uk/for-home/
Lots of free resources for Primary age
Big History Project
https://www.bighistoryproject.com/home
Aimed at Secondary age. Multi disciplinary activities.
Geography Games
https://world-geography-games.com/world.html
Geography gaming!
Blue Peter Badges
https://www.bbc.co.uk/cbbc/joinin/about-blue-peter-badges
If you have a stamp and a nearby post box.
The Artful Parent
https://www.facebook.com/artfulparent/
Good, free art activities
Red Ted Art
Easy arts and crafts for little ones
The Imagination Tree
https://theimaginationtree.com
Creative art and craft activities for the very youngest.
Toy Theater
Educational online games
DK Find Out
https://www.dkfindout.com/uk/?fbclid=IwAR2wJdpSJSeITf4do6aPhff8A3tAktnmpaxqZbkgudD49l71ep8-sjXmrac
Activities and quizzes
Twinkl
This is more for printouts, and usually at a fee, but they are offering a month of free access to parents in the event of school closures.
Open Culturehttp://www.openculture.com/
Free ebooks https://www.gutenberg.org/Audible – free stories, read aloudhttps://stories.audible.com/start-listen
30 minutes daily PE workout for kids and teens
Joe Wicks – Body Coach
https://www.youtube.com/user/thebodycoach1
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A post shared by Vanessa McC (@nessascityblog) on Mar 22, 2020 at 8:36am PDT