Sheetsu - Turn Google Spreadsheet into API
Publisheet - Publish your Excel sheets to the web as dynamic web applications with formula support.
SpreadSimple - A blazing-fast way to create and manage sites using Google Spreadsheets
SpreadsheetWEB - SpreadsheetWEB is a no-code platform that helps businesses translate their collective Microsoft Excel expertise into robust web applications with limited or no reliance on IT resources.
SheetAside - Access your Google Sheets from where you are
CALCONIC_ - Build & add interactive calculators to your website! Choose from more than 50 premade calculators or build your own from scratch. No coding required. Free plan available. Zapier Integration. Publish Anywhere.