Postman - The Collaboration Platform for API Development
Apigee - Intelligent and complete API platform
Django REST framework - Django REST framework is a toolkit for building web APIs.
OpenLegacy - API integration software
Amazon API Gateway - Create, publish, maintain, monitor, and secure APIs at any scale
Jira - The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.