Our Open Source Projects Postman regularly creates (and constantly improves) open-source projects on GitHub.Click to see full answer. Also, is postman a opensource?Postman: This tool is one of the open source tool and basically a browser extension. This is very easy tool of API testing for beginners. 3. REST Assured: This is open source tool and is best tool for automation of Rest APIs using Java.Subsequently, question is, what is Postman tool used for? Postman is a powerful tool for performing integration testing with your API. It allows for repeatable, reliable tests that can be automated and used in a variety of environments and includes useful tools for persisting data and simulating how a user might actually be interacting with the system. Also to know is, is postman free to use? Postman 5.0 is free to all users, and available as Mac, Windows and Linux native apps, as well as a Chrome app. The Postman free app has always included extensive collaboration, testing and automation features, making API development faster and easier.How do you become a postman?Get Postman from www.getpostman.com. Postman can be installed as a Chrome or Mac app. We recommend getting the desktop client, but the Chrome version will run on any platform and is identical in functionality and appearance.