Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Sens'it 3 - Six sensors, a button so many possibilities
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
FriendlyData - Communicate with databases like a human
Sheetsu - Turn Google Spreadsheet into API
mlsql - Infer SQL queries from plain-text questions and table headers.