Google announced today that they have "Add Ons" for Google Forms. If you go to create a new form, you will notice the Add Ons menu is now there just like it is in Sheets and Docs. The Add Ons will allow you to add features to your forms for easing work flow or managing data. For example, Form Limiter can be used to shut off a form on specific date or close an option once a spreadsheet cell gets to a certain limit. This could come in handy when having people sign up for something where there is a limit to the number of attendees. Check out the Forms Add Ons Store to see what is available.