Carrd - Simple, responsive one-page site creator.
Publisheet - Publish your Excel sheets to the web as dynamic web applications with formula support.
Gridbox - Create beautiful landing pages in seconds.
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.
PageFabric - PageFabric is a free static website editor for Windows 10.
SpreadsheetConverter.com - Use online spreadsheets, smart forms and beautiful charts in your blog or website. Put your booking and order forms online. Show live charts. Change any cell and the online spreadsheet or live chart immediately updates itself.