Render your Android screens without a physical device or emulator.

WebLOAD – Performance and Load Testing for the Most Challenging Web Applications

Browser and Mobile Automation Test Framework for Node.js

RapidAPI for Mac is a full-featured HTTP client that lets you test and describe the APIs you build or consume. It has a beautiful native macOS interface to compose requests, inspect server responses, generate client code and export API definitions.

Test, scrape, generate, and automate without the pain and expense of hosting your own headless browsers.

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.