Jest is a delightful JavaScript Testing Framework with a focus on simplicity.

Uptime Kuma is an easy-to-use self-hosted monitoring tool.

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

All-in-one observability. New Relic Dashboard Video Tour Video Tour Data for engineers to monitor, debug, and improve their entire stack.

Playwright enables reliable end-to-end testing for modern web apps.

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.