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

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.

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.

Unifying API testing, API Performance testing, API Mocks and UI testing.

Browser and Mobile Automation Test Framework for Node.js