Mockoon is the easiest and quickest way to design and run mock REST APIs.

Hand-crafted lightweight Rest Client for testing APIs. Supports collections, environments, git collaboration and local storage.

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.

Design, debug, and test APIs locally or in the cloud

Fully integrated API and web service testing capabilities that automate end-to-end functional API testing.

The World's first AI Driven Enterprise Software Reliability Platform