Humanities (Geography, History & Languages)
National Geographic Kids - https://www.natgeokids.com/uk/ - Activities and quizzes for younger kids.
Geography Games - https://world-geography-games.com/world.html - Geography gaming!
Ben Fogle Talks - https://www.instagram.com/benfogle - Ben Fogle, Wilderness expert, is doing Instagram Live talk sessions about his time on different expeditions.
Big History Project - https://www.bighistoryproject.com/home - Aimed at Secondary age. Multidisciplinary activities.
Virtual Museum Tours - https://www.thrillist.com/news/nation/virtual-museum-tours - Thrill List have created a list of museums and art galleries that provide virtual tours of their buildings and artefacts.
Languages (Modern Foreign Languages)
Duolingo - https://www.duolingo.com - Learn languages for free. Web or app.