American Association of School Librarians selects the best apps each year for teaching and learning. Here's the link for the 2014 selection, and you can get to prior year choices from this page as well.

The American Association (AASL) of School Librarians vets and selects 25 websites each year to support teaching and learning. They've done this for a 5 years and have selected some great resources. Be sure to check them out: " AASL " Learning Standards & Program Guidelines " Best Websites for Teaching & Learning " Best Websites for Teaching & Learning 2014