Developer Portals and API Gateways

moesif.com: How to choose the right API Gateway for your platform: Comparison of Kong, Tyk, Apigee, and alternatives
Google Apigee API Manager Apigee is an API management platform for developing, analyzing, securing & scaling various APIs and apps. It provides API technology and services for a wide range of organizations and developers to stimulate the pace of digital business. Through API, Apigee assists businesses to securely share data and services across various channels/devices in order to enhance the customer experience. Companies can manage growth and spikes in API traffic with features like traffic isolation and independent scaling.
3scale API Manager
WSO2 API Manager
Kong API Manager
Tyk API Manager
Backstage Developer Portal: Spotify has now open-sourced Backstage (under Apache-2.0), the platform of platforms to create a great developer experience across hundreds of squads at Spotify

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