Our DCs have classes. You could:
Go to the library. Our libraries have iPads, jigsaws, crafts, etc. as well as books.
Badge work for Scouts/Girlguiding. You could do PawPrint as an alternative.
Baking, seasonal crafts, jigsaws, board games, mindfulness colouring, etc. at home.
CBBC website has lots to do both off and online.
Blue Peter badge work,
Movie night on a Sat with popcorn. Pick up DVDs at charity shops for 50p.
Instrument practise. Recorder is probably cheapest: DD1 found one in a charity shop for 50p.
The Week Junior. My Dad bought the DC a subscription. Lots to read together plus crosswords, puzzles and word searches.
Drawing using Art4Kids hub on YouTube.
CBBC radio and podcasts while doing chores/helping with chores.