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.

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

Status, performance and uptime monitoring for cron jobs, websites, APIs and more.

REST API client library for .NET

Puppeteer is a Node.js library which provides a high-level API to control Chrome/Chromium over the DevTools Protocol.