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

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

  2. Collaborative design, instant API mock, generated documentation, integrated code samples, debugging and automated testing

  3. Codegiant - Issue tracking, git repositories, continuous integration and documentation in a single platform.

  4. Dash is an API Documentation Browser and Code Snippet Manager. Dash searches offline documentation of 200+ APIs and stores snippets of code. You can also generate your own documentation sets.

  5. The #1 software development tool used by agile teams. Jira Software is built for every member of your software team to plan, track, and release great software.

  6. Intelligent and complete API platform

  7. Bitbucket is a free code hosting site for Mercurial and Git. Manage your development with a hosted wiki, issue tracker and source code.

  8. DASH is a secure, blockchain-based global financial network which offers private transactions.

  9. Django REST framework is a toolkit for building web APIs.

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

  11. Gravitee.io is a flexible, lightweight and an open source API management solution.

    freemium

  12. Paw is a REST client for Mac.