1. A powerful high-level API description language for web APIs.

  2. RAML is a solution that manages an API lifecycle from design to sharing.

  3. Postman is the most efficient way to test, develop and document APIs.

    freemium $8.0 / Monthly (Per user/month billed annually)

  4. Create, publish, maintain, monitor, and secure APIs at any scale

  5. Paw is a REST client for Mac.

  6. Log, monitor and measure your API usage to solve API problems fast.

  7. The ignite platform provides a holistic service catalog as well as an end-to-end lifecycle with a focus on plan, design, and build, generating most of the required code and gateway settings directly to your CI/CD and run.

    paid

  8. The most intuitive cross-platform REST API Client รฐยŸย˜ยด

  9. HTTP proxy / HTTP monitor / Reverse Proxy

  10. YAML 1.2 --- YAML: YAML Ain't Markup Language

  11. StopLight, providing engineering teams with the best way to document, test, and build web APIs.

  12. (JavaScript Object Notation) is a lightweight data-interchange format