Charles Proxy - HTTP proxy / HTTP monitor / Reverse Proxy
Python - Python is a clear and powerful object-oriented programming language, comparable to Perl, Ruby, Scheme, or Java.
Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
Rust - A safe, concurrent, practical language
Postman - The Collaboration Platform for API Development
Java - A concurrent, class-based, object-oriented, language specifically designed to have as few implementation dependencies as possible