DataNitro - DataNitro enables users to automate Excel with Python and also to turn a spreadsheet into a database GUI - or a web server backend.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Sheetbase - Free, fast and fun way to build modern websites and apps 🛠️
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
Sheetsu - Turn Google Spreadsheet into API