A Google+ Game for Hangouts. You and others (your Google+ contacts) race with each other to find famous works of art within Google maps (indoor street view). Currently, the Palace of Versailles is the only available game.
Google Spreadsheets script that can help you manage the flow of Google Drive files that students share with you. Will create folders for you for as many course sections as you need.
This virtual classroom/web meeting application allows you to meet with up to 200 people for free. You can video chat, share your screen, run polls, and present PowerPoint shows.
Accessibility extension for Google Chrome that enable text-to-speech and a picture dictionary in Google Docs. The voices available are for English, French, and Spanish.