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.

Datadog is a cloud-based monitoring and analytics platform that provides observability and security for cloud-scale applications

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.

Bruno is a Fast and Git-Friendly Opensource API client, aimed at revolutionizing the status quo represented by Postman, Insomnia and similar tools out there.

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

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