Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
WrapAPI - Build an API on top of any website
Treblle - Mission Control For Your APIs
Apiary - Collaborative design, instant API mock, generated documentation, integrated code samples, debugging and automated testing
Albato - No matter the process. Automate it with no-code.
Postman - The Collaboration Platform for API Development