Just found a great compilation of resources from a blog. These resources are for Language Arts Common Core for fourth grade but 3rd and fifth grades are linked below the download.
Some of the resource are single download from Teachers Pay Teachers. You can download these by creating an account -- really simple and no cost.
Some of the resources are online games and interactives. Even if you have no plan to use the common core next year, these are some amazing resources.
HoJo's Teaching Adventure