These links will take you to sites which are full of excellent games and activities to help your child practise their literacy skills.
BBC Spellits (Spelling games) (KS2)
BBC Bitesize (Spelling and grammar) (KS2)
Crickweb (Literacy and maths educational games) (KS2)
Learning Games for Kids (Spelling and word games) (KS1 & KS2)
Eduplace.com (Levelled spelling and vocabulary games) (KS1 & KS2)
PrimaryGames.com (Spelling rules, incl. vowels, blends, plurals etc) (KS1 & KS2)