HATEOAS (Hypermedia as the Engine of Application State), Open API Initiative (OAI), RAML - RESTful API Modeling Language. See Representational State Transfer ( REST ).
Apigee - “The leading API platform for enterprises and developers”.
I was told: If you work by Apigee APIs, some other third-party services like Twitter accept nuch more API traffic than if you would access the APIs of the third-party services directly
Apiary - “Powerful API Design Stack. Built for Developers. Work together to quickly design, prototype, document and test APIs”.
The commercial Zapier - “Connect your apps and automate workflows. Easy automation for busy people. Zapier moves info between your web apps automatically, so you can focus on your most important work”.
Zapier "Explore All Apps" - List of all online Internet Web services with ZAPIER interface, e.g. Twitter.
Quentn - Next Level Marketing Automation "Zapier Einführung" - “Zapier ist ein US-Anbieter, der es Ihnen erlaubt, Ihre Quentn-Kampagne mit über 1.500 Drittanbietern nahtlos zu verknüpfen. Dies ist immer dann sinnvoll, wenn Sie Kontaktdaten aus Ihrer Quentn-Kampagne an einen Drittanbieter versenden oder Daten von diesem empfangen möchten”.