Algo by AirDev - Turn a Google Sheet model into a web app in 5 minutes
SpreadSimple - A blazing-fast way to create and manage sites using Google Spreadsheets
SpreadShare - Explore community-curated spreadsheets.
Magic Spreadsheet - Human workforce and AI plugged into your Google Spreadsheets
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
Clearbit - Clearbit provides Business Intelligence APIs