Awesome Drive allows you to edit and automatically sync your Microsoft Office documents in your Google Drive.
Share to Classroom: allows you to push web content directly to your students computers (if they are logged into your classroom) or create an assignment for later.
SnagIt - Use SnagIt to take a screenshot, video, or picture of a smaller area on your screen. If your video is under 20 seconds, you can even turn it into a gif if you like!
One Tab - Use OneTab to share a collection of websites with students or colleagues. All websites you designate will open up as a list in a tab.
Drive 20 - Open up 20 google docs at once, without having to click on each individual document.