Doctopus
Doctopus helps you organize your Google Documents into folders. In the world of online folders, this becomes valuable. Doctopus is very helpful for teachers that want to organize student work into folders automatically. For teachers going paperless, this is a big step in the right direction.
Mindomo - Mind Mapping and Concept
This is an outlining app for the Chrome browser.
Diigo
This is an organization and annotation tool. The website helps you keep bookmarks. You can also annotate PDFs.
AwesomeDrive for Google Drive
This extension allows for one-click editing to Microsoft Office products on Google Drive.
Google Classroom
This is one of the best tools to communicate and track student work.
Flubaroo
This add-on helps you grade your students, give you useful statistics, and it gets excellent ratings.
Goobric Web App Launcher
This is a rubric creations tool add-on that is sometimes used with Doctopus.