What is the best open source security testing tool for web and mobile applications?

Please someone tell me about the what is the best open source security testing tool for web and mobile applications.

Nowadays, as most of the mobile apps target multiple devices and platforms, the testers often find it daunting to perform security testing. So, for this reason, the testers need specialised tools with an open source touch to check whether a mobile app is 100 percent secure or not.

Mobile app testing can be quite cumbersome. To ease this process, businesses make separate teams for testing and analyzing open source tools.

iPad File Explorer

This tool can be used for exploring the file structure of iPad apps. Not only this, but it can also be used for exploring the file structure of a wide variety of iOS applications. The third-party tool is designed with features to display and read app data apparently like normal file systems.

OWASP Zed Attack Proxy Project

It was developed by AWASP and is available for Unix/Linux, Macintosh and Windows platforms. Originally, the tool was designed as an integrated penetration testing tool for web testing applications. OWASP Zed Attack Proxy Project is currently used by testers to access security of a wide variety of mobile applications. As the tool allow app testers to design and send mischievous messages, it becomes easier for the developers to breach the security of mobile apps by attacking the server-side resources through mischievous messages.

Android Debug Bridge

Android Debug Bridge is designed to evaluate the security of mobile apps across many Android devices at the command line. This program can be used as a client-server and can be connected to emulators, in addition to install and debug the programs.