Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.

FriendlyData - Communicate with databases like a human

Zoho Creator - Zoho Creator is a low-code application development platform that helps you build a custom, mobile-ready apps to run your business.

SpreadsheetDB - A database that you can query with spreadsheets

QuickBase - Quickbase provides a no-code operational agility platform that enables organizations to improve operations through real time insights and automation across complex processes and disparate systems. ​​

Google Sheets - Synchronizing, online-based word processor, part of Google Drive.