Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
WrapAPI - Build an API on top of any website
CloudBoost.io - One Complete Database Service that does data-storage, search,real-time and a whole lot more.
Apinizer - Create, Secure and Publish your API in 21 seconds
Supabase - An open source Firebase alternative