Kong/Tyk/Zuul/strongloop/Ambassador/Gravitee
IBM Reference Architecture for API Management: https://developer.ibm.com/apiconnect/documentation/api-101/ibm-reference-architecture-api-management/
Rethinking API Management Architecture: https://www.infoq.com/presentations/api-management-architecture
Taking A Fresh Look At What Open Source API Management Architecture Is Available: http://apievangelist.com/2014/10/05/taking-a-fresh-look-at-what-open-source-api-management-architecture-is-available/
Architecting API Management Solutions With WSO2 API Manager: https://dzone.com/articles/architecting-api-management-solutions-with-wso2-ap
API Management Platforms Capabilities: https://www.infoq.com/research/api-management
API MANAGEMENT 101: API MANAGEMENT BASICS: http://www.apiacademy.co/resources/api-management-101-api-management-basics/