What are some alternatives?
Postman - Postman is the most efficient way to test, develop and document APIs.
Apigee - Intelligent and complete API platform
Gravitee.io - Gravitee.io is a flexible, lightweight and an open source API management solution.
MuleSoft - MuleSoft provides an integration platform for connecting any application, data source or API, whether in the cloud or on-premises.
Tyk - Tyk is an open-source API gateway and API management platform.
Apiary - Collaborative design, instant API mock, generated documentation, integrated code samples, debugging and automated testing