How Many Words Can You Make? (Scrabble type)

Word Invasion provides practice in matching word types. (nouns, verbs, adverbs, adjectives, pronouns, prepositions) Arcademic Skill Builders

Verb Viper  choose correct verb tenses (present, past, past participle), recognize correct verb forms (ran instead of runned),
and recognize subject/verb agreement (I am, he is).

Adjectives and Adverbs PPT Presentations

Synonyms and Antonyms PPT presentations

Writing: Grammar and Punctuation (TV411)

Multimedia Grammar Glossary

Proofreading Makes Perfect! Gr. 4 (spelling, usage, capitalization and punctuation)
Proofreading Makes Perfect! Gr. 5 (spelling, usage, capitalization and punctuation)
Proofreading Makes Perfect! Gr. 6 (spelling, usage, capitalization and punctuation)

Houghton Mifflin Spelling and Vocabulary (a number of activities by grade levels) Grade 4, Grade 5, Grade 6

Road To Grammar (365 grammar quizzes)

Grammar Blast

Grammar Gold (quotation marks)

Power Proofreading

Wacky Web Tales: Students practice their parts of speech, fill in the blanks, and create their own
 wacky web tales

Create Your Own Adventure!

Grammar Gorillas An online grammar game; if you click on the right word in the sentence,
our friends get a banana.

Learning Vocabulary Can be Fun!

Rooting Out Words - Help Remainder the Dog gather enough mushrooms to sell at the market by uncovering the roots of words.
(three categories, several difficulty levels - from FunBrain)