This is a great site for all general revision and caters for KS1 and KS2. No passwords needed.
https://www.lgfl.net/pages/Content-Grid.aspx (Choose KS1 and subject e.g. Maths)
Interactive games to support general Maths learning/practise in topics including Shape and Weight, Calculation and Money.
https://mathsframe.co.uk/ (most games do not require subscription)
https://mathszone.co.uk/ (range of Year Levels available)
https://uk.ixl.com/ (Maths quizzes by year group)
https://nrich.maths.org/9412 (Problem solving and reasoning)
Huge range of fun games to learn multiplication facts for KS1 and KS2 pupils.
https://www.topmarks.co.uk/english-games/5-7-years/letters-and-sounds (includes spelling and grammar activities)
https://www.everyschool.co.uk/english.html (reading, high frequency words, stories and writing)
https://www.gamestolearnenglish.com/ (Games to learn English)
https://learnenglish.britishcouncil.org/en/games (Games to learn English)