Sheetson - Instantly turn any Google Sheet into RESTful API
Anania - Self-Service Analytics For Your Data
Stein - Use Google Sheets as your no-setup database
Mixpanel - Mixpanel is the most advanced analytics platform in the world for mobile & web.
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
Kanary - Find exposed personal information & delete it.