Free & OpenSource REST API Testing Tool for all levels in a Test Pyramid

Burp or Burp Suite is a set of tools used for penetration testing of web applications. It is developed by a company named Portswigger who make freely available a Web Security Academy which has a range of lessons on penetration testing.

Automate API workflows. Chain HTTP requests. Validate. Zero code.

Selenium automates browsers. That's it! What you do with that power is entirely up to you.

Simulate APIs, integrations, and environments at enterprise scale.

Postman is an API platform for building and using APIs. Postman simplifies each step of the API lifecycle and streamlines collaboration so you can create better APIs—faster.