Postman - The Collaboration Platform for API Development
Firebase - Firebase is a cloud service designed to power real-time, collaborative applications for mobile and web.
Django REST framework - Django REST framework is a toolkit for building web APIs.
CloudBoost.io - One Complete Database Service that does data-storage, search,real-time and a whole lot more.
Amazon API Gateway - Create, publish, maintain, monitor, and secure APIs at any scale
Supabase - An open source Firebase alternative