Sheetsu - Turn Google Spreadsheet into API
Coefficient.io - Automatically Sync Google Sheets with your Business Systems. No-code reporting and analysis tool.
SpreadSimple - A blazing-fast way to create and manage sites using Google Spreadsheets
Airboxr - Data automation for DTC brands.
SheetAside - Access your Google Sheets from where you are
Chartmat - Build dashboards and apps on top of Google Sheets