Postman is the complete toolchain for API developers, used by more than 3 million developers and 30,000 companies worldwide.
Swagger is a powerful open source framework backed by a large ecosystem of tools that helps you design, build, document, and consume your RESTful APIs.
The Apiary platform is the only developer-centric solution with tooling for every stage of the API ... Big news for #api developers blog.apiary.io/2016/01/18/W
Secure API management, mobile BaaS, developer productivity, API monetization for mission critical business.
SoapUI, is the world leading Open Source Functional Testing tool for API Testing. It supports multiple protocols such as SOAP, REST, HTTP, JMS, AMF and JDBC.
A tool for creating and maintaining excellent Developer Portals and API or Technical Documentation