Fusio - Open source API management platform
Tyk - Tyk is an open-source API gateway and API management platform.
3scale - 3scale is an API Management Platform that makes it easy to open, distribute, control, and monetize public, private or internal APIs.
Heroku - Agile deployment platform for Ruby, Node.js, Clojure, Java, Python, and Scala. Setup takes only minutes and deploys are instant through git. Leave tedious server maintenance to Heroku and focus on your code.
Postman - The Collaboration Platform for API Development
DreamFactory - DreamFactory is an API management platform used to generate, secure, document, and extend APIs.