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.
StatusGator - Monitor all your hosted applications, vendors, and websites, and keep your team informed of outages. StatusGator is the world's premier status aggregator, status page, and website monitoring tool.
Supabase - An open source Firebase alternative
WrapAPI - Build an API on top of any website
RemoteStorage - An open protocol for per-user storage OWN YOUR DATA