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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
Leaf PHP - Create clean, simple but powerful web apps and APIs quickly.
Sheetsu - Turn Google Spreadsheet into API
UberFreight - Leveling the playing field for America’s truck drivers
SheetBest - Turn a Google SpreadSheet into a JSON Database API