Yoga you can do with the kids, to chill them out?
Online sci-fi books
All sorts of engaging educational videos
National Geographic Kids
Activities and quizzes for younger kids.
Digital enterprise award scheme you can complete online.
Paw Print Badges
Free challenge packs and other downloads. Many activities can be completed indoors. Badges cost but are optional.
All kinds of making.
Red Ted Art
Easy arts and crafts for little ones
Play DnD and other RPGs with friends online or make new friends and learn how to play. It’s free for basic serivce (which is likely all you will need)
Audiobooks. Like Audible, but FREE! Basically if you aren’t aware, Project Gutenberg stores all books which are outside copyright (and therefore free to read https://www.gutenberg.org/)
Librivox is where people have taken these books and then narrated them.
Free online puzzles
You can help make a difference and keep boredom at bay right here –
Complete online free music concerts
Online theatre productions
Online plays and theatrical performances
Free colouring books to download and print