Apigee - Intelligent and complete API platform
Postman - The Collaboration Platform for API Development
Apiary - Collaborative design, instant API mock, generated documentation, integrated code samples, debugging and automated testing
Postman Workspaces - Organize and speed up API development work
curlx - If cURL and Postman had a baby 👶
Tyk - Tyk is an open-source API gateway and API management platform.