Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
SpreadsheetWEB - SpreadsheetWEB is a no-code platform that helps businesses translate their collective Microsoft Excel expertise into robust web applications with limited or no reliance on IT resources.
FriendlyData - Communicate with databases like a human
Spreadsheet Booster - Import external data directly into your spreadsheets
SpreadsheetDB - A database that you can query with spreadsheets
Sheetsu - Turn Google Spreadsheet into API