Publisheet - Publish your Excel sheets to the web as dynamic web applications with formula support.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
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.
Grist - Grist makes it easy to transform spreadsheets into a custom database where data is truly actionable.
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.
Rowy - Rowy is an open-source low-code platform to build your product, from MVP to scale. Manage your database in a spreadsheet-like UI, write Cloud Functions effortlessly in the browser, build automation with ready-made extensions to your favorite tools.