Percy is a visual testing and monitoring tool that focuses on detecting visual changes in web applications

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.

HyperTest is a no-code test automation tool that regresses all your APIs by auto-generating integration tests using your network traffic, also giving a way to reproduce these failures inside actual user-journeys.

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

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

Create automatic monitors for detecting and scanning changes on web pages, evaluate content based on conditions you define and trigger actions such as notifications, sounds, emails etc.