SpreadSimple - A blazing-fast way to create and manage sites using Google Spreadsheets
ginstr - ginstr is a business software that lets user create custom form-based apps for customers or employees to download, fill out, sign and return from any web device.
Algo by AirDev - Turn a Google Sheet model into a web app in 5 minutes
Auto-PDF - Web-based PDF form automation
Sheety - Turn any Google sheet into an API instantly, for free. Power websites, apps, or whatever you like, all from a spreadsheet. Changes to your spreadsheet update your API in realtime. Neat
Forms Manager - Forms Manager is an online form of automation software that helps businesses build forms, manage workflows, and analyze real-time reports.