Mantra is a collection of free and open source tools integrated into a, which can become handy for students, penetration testers, web application developers, security professionals etc. It is portable, ready-to-run, compact and follows the true spirit of free. open source. It comes as a self-extracting 7-zip exe archive. It is a Firefox portable with the extensions pre-built. It also contains a set of tools targeted for web developers and code debuggers which makes it handy for both offensive security and defensive security related tasks.
Source: https://thehackernews.com/2010/12/mantra-browser-based-security-framework.html