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.

Swagger UI allows anyone — be it your development team or your end consumers — to visualize and interact with the API’s resources without having any of the implementation logic in place

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

Hoppscotch is an open-source API development ecosystem that helps you create and test your API requests saving precious time in development.

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

Hosted System Status Pages Fully customizable, featuring incident tracking, subscriber notifications, and much more