What are some alternatives?
Apigee - Intelligent and complete API platform
WSO2 API Manager - WSO2 API Manager is a 100% open source enterprise-class solution that supports API publishing, lifecycle management, application development, access control, rate limiting and analytics in one cleanly integrated system.
Postman - Postman is the most efficient way to test, develop and document APIs.
Kong - An open-source management layer for APIs and microservices.
Apiary - Collaborative design, instant API mock, generated documentation, integrated code samples, debugging and automated testing
Tyk - Tyk is an open-source API gateway and API management platform.