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

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

  2. DreamFactory is an open source REST API backend for mobile, web, and IoT applications.

  3. API Management and SOA Governance for enterprises and developers

  4. AWS CloudTrail is a web service that records AWS API calls for your account and delivers log files to you.

  5. The #1 Integration Cloud - Build Integrations anytime, anywhere with no coding required using Dell Boomi's industry leading iPaaS platform.

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

  7. SoapUI Pro is one of the most prominent API testing platforms around, allowing developers to quickly prototype the functions of their apps and get them to market with little hassle.

  8. Paw is a REST client for Mac.

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

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

  11. The Grunt ecosystem is huge and it's growing every day.

  12. RESTClient can be used to test variety of HTTP communications and RESTful webservices.