Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Postman - The Collaboration Platform for API Development
Creativity 365 - Cross-device content creation suite
Apiary - Collaborative design, instant API mock, generated documentation, integrated code samples, debugging and automated testing
Microsoft Teams - Microsoft Teams provides the enterprise-level security, compliance and management features you expect from Office 365, including broad support for compliance standards, and eDiscovery and legal hold for channels, chats, and files.
Django REST framework - Django REST framework is a toolkit for building web APIs.