Grammar

Connectives Football Game - great for learning connectives
Sentence Diagramming
Grammar Blast - a variety of games on different parts of grammar
Word Frog - a game that teaches about antonyms, synonyms and homonyms
Word Invasion- a game that teaches about parts of speech
Verb Viper - students learn about verb tenses and forms through this game
Prefixes - 25 interactive games to learn about prefixes
Suffixes - interactive games to learn about suffixes
Synonyms - interactive games to learn about synonyms
Homophones - interactive games to learn about homophones
Root Words - interactive games to learn about root words
Analogies - interactive games to learn about analogies
Antonyms - interactive games to learn about antonyms
Grammar Gorillas - parts of speech - 2 levels
Learn the Vowel Sounds - an interesting video aimed at 5 year olds that teaches them the vowel sounds
Grammar Ninja - a great game that helps with grammar
Free Rice - solve grammar or vocabulary questions while helping others.
Homophones Quiz - an online activity
Sentence Structure Quiz - an online quiz
Subject-Verb Agreement Quiz - an online quiz.
Wasted Words 1 - an online matching activity
Wasted Words 2 - an online matching activity.
Pronoun Case Quiz - an online quiz.
Parallel Structure - another online grammar quiz dealing with lists.
Adverbs and Adjectives Quiz - an online quiz.
Pick the Perfect Word Game - find verbs in the this Charlotte's Web game.
Interactive Grammar Exercises - a long list of online grammar activities.
Get Smart English 2 - loads of links for games and activities to try.
Interactive Whiteboard Games - from PBS