PlanetScale - The last database you'll ever need. Go from idea to IPO.
Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Upstash - Upstash provides Serverless Redis and Kafka as a service.
FriendlyData - Communicate with databases like a human
restdb.io - restdb.io lets you create databases and REST APIs quickly. Development databases are free. Powerful web-based and mobile-friendly data management.
SpreadsheetDB - A database that you can query with spreadsheets