Google Docs:
Avery Label Merge - Creates a mail merge using a Google spreadsheet for merge data. Print the document it creates, which is properly formatted for Avery products.
EasyBib Bibliography Creator - Create a bibliography easily in any format APA, Chicago, or MLA.
Google Sheets:
SuperQuiz - Super Quiz adds brilliant functionality and assessment tools to a quiz made with Google Forms.
Flubaroo - helps you quickly grade and analyze online assignments and assessments, as well as email scores to students!
EZ Query - Create a new sheet that only shows the information you want and is always up-to-date.
FormMule - Sends targeted, personalized emails from a Google Sheet.
Autocrat - Sends targeted, personalized emails with file attachments(pdf or doc).
Google Forms:
docAppender - This add-on allows form submissions to be attached to the bottom of different pre selected documents.
FormNotifications - This allows you to set up email notifications when a form is submitted.
FormLimiter - Shuts off a Google Form after a max number of responses, at a date and time, or when a spreadsheet cell equals a value.
FormRanger - Allows you to populate multiple choice, list, checkbox, and grid options from columns in any Sheet or Doctopus roster.
FromPublisher - Automatically create a Document or Spreadsheet, based on a pre-selected template, for each form submission.
ChoiceEliminator - Choice Eliminator will eliminate an option from a multiple choice, list, or checkbox question after a user has submitted it.
gMath for forms - Include math equations in your questions for students.