Frida is a dynamic instrumentation toolkit for developers, reverse-engineers, and security researchers to analyze and modify application behavior.
Gobuster is a tool to brute-force URIs, DNS subdomains, and virtual hostnames, aiding in web application reconnaissance.
JWT Debugger is a web application to create, encode, decode, and debug JWT (JSON Web Tokens).
Nessus Essentials is a free vulnerability scanner by Tenable, offering high-speed, in-depth scanning for up to 16 IP addresses.