When you play this game, you need to find the silent letters in words to save the earth from the invaders. http://www.bbc.co.uk/skillswise/words/spelling/soundandspell/silentletters/index.shtml
Here is a page to practice prepositions.
On this website you can choose a story theme and then practice parts of speech to create a "wacky" tale. It is a bit like MadLibs. Want to write a Wacky Tale?
You don't need to register to play. Just choose "maybe later." I Know That ...A game about grammar
Another grammar game. You choose the parts of speech to practice. Octopus invaders!
These are grammar games that help practice with parts of speech and sentence structure. You can try some of the 4th grade games too! They're fun! http://www.harcourtschool.com/menus/preview/harcourt_language/grammar_park.html
This is a game modeled after the "Millionaire" game. It is for practicing using guide words. Great skill for third graders. We work on it at school,but it takes LOTS of practice. http://www.quia.com/rr/45806.html
Bookhive is a site for finding books to read as well as sharing your own reviews of books you enjoyed. http://www.plcmc.org/bookhive/