Typeform - Create beautiful, next-generation online forms with Typeform, the form & survey builder that makes asking questions easy & human on any device. Try it FREE!
Sheetsu - Turn Google Spreadsheet into API
Survey Monkey - Create and publish online surveys in minutes, and view results graphically and in real time. SurveyMonkey provides free online questionnaire and survey software.
SpreadSimple - A blazing-fast way to create and manage sites using Google Spreadsheets
Jotform - Free Online Form Builder & Form Creator
SheetAside - Access your Google Sheets from where you are