Voiden is a developer-first API client with local storage, Git-integrated, all based on markdown + offline support.

Requestly is an open-source tool that simplifies API development, testing, mocking, and integration for developers and QAs.

Jest is a delightful JavaScript Testing Framework with a focus on simplicity.

Monitor network requests and API failures with real-time insights

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.

The world’s first API testing platform that auto-generates unit test cases with dependency mocks from API calls. Using advanced AI, it simplifies test creation, debugging, and evolution, ensuring comprehensive coverage and boosting software quality.