Top Kali Nethunter Alternatives for Mobile Penetration Testing
Kali Nethunter is a powerful and popular open-source Android penetration testing platform, celebrated for bringing the robust Kali Linux distribution and its toolsets to mobile devices. It offers advanced features like Wireless 802.11 frame injection, one-click MANA Evil Access Point setups, and HID/BadUSB attacks. However, if you're looking for different functionalities, broader device support, or simply exploring other options, there are several excellent Kali Nethunter alternatives available that cater to various mobile security needs.
Best Kali Nethunter Alternatives
Whether you're a seasoned security professional or an enthusiast, these alternatives offer unique features and approaches to mobile penetration testing and custom Android environments.

Android
Android, as the foundational operating system for mobile devices, serves as a crucial Kali Nethunter alternative for those seeking to build custom environments. It's a free, open-source platform with a Linux kernel, offering extensive ARM support and compatibility with various Android devices. While not a direct penetration testing suite, Android's open nature allows for significant customization and the integration of security tools, making it a flexible base for security enthusiasts.

OxygenOS
OxygenOS, developed by OnePlus, is an Android-based operating system that offers a light and essential user experience with subtle, useful features. While it doesn't inherently provide penetration testing tools like Kali Nethunter, its customizable nature and status as a free, Android-based mobile OS make it a viable alternative for users who prefer a clean, performance-oriented system that can be rooted to install custom security applications.

Pwnix
Pwnix, from the Android Open Pwn Project (AOPP), is a direct Kali Nethunter alternative as it's the first Android ROM specifically built for network security. It's a free, open-source Android platform that comes with features like wireless drivers and dedicated penetration testing capabilities, making it a strong contender for those seeking an alternative mobile security OS.

AOSP Extended
AOSP Extended is an AOSP (Android Open Source Project) based ROM that provides a stock UI/UX with various customization features. As a free, open-source Android platform, it offers a clean slate for users who want to build their mobile security environment from the ground up, making it a flexible Kali Nethunter alternative for those who prefer to cherry-pick their tools.

Fairphone Open
Fairphone Open is an alternative, open-source version of Fairphone OS, emphasizing transparency and ownership. While it's a mobile OS focused on ethical production and user control rather than security testing, its free and open-source Android base makes it a unique Kali Nethunter alternative for users who prioritize system transparency and wish to build a custom, secure environment on a supported device.

Astian OS
Astian OS, based on the discontinued Firefox OS, is a free, open-source, and self-hosted operating system. It's designed to support mobile devices and TVs, offering features like configurability, Linux-based architecture, and scalability. While not a direct penetration testing platform like Kali Nethunter, its open-source nature and Linux foundation could appeal to users looking to build a customized security-focused environment.

HarmonyOS
HarmonyOS is a lightweight, compact operating system that's free, open-source, and built on Linux/Android. Designed for various smart devices, it offers powerful functionality and ARM independence. While not specifically a pentesting OS, its open-source nature and robust operating system features position it as a potential Kali Nethunter alternative for those who might adapt a versatile OS for security research.

Andrax
Andrax is a direct and compelling Kali Nethunter alternative, specifically developed as a penetration testing platform for Android smartphones. It's a free, open-source application that provides a complete suite of pentesting utilities in one package, making it an excellent choice for mobile security professionals and enthusiasts looking for a dedicated solution.

Havoc-OS
Havoc-OS is a free, Android-based mobile operating system that offers extensive customization options and a smooth user experience. While it doesn't come with pre-installed penetration testing tools, its flexible nature as a mobile OS makes it a suitable Kali Nethunter alternative for those who prefer to build a personalized environment and install security tools manually.

iodé
iodé is an operating system powered by LineageOS and based on the Android mobile platform, with a strong focus on user privacy and security. As a free Android OS, it aims to protect user data with built-in privacy features, making it an interesting Kali Nethunter alternative for users who prioritize privacy and wish to combine it with their security research efforts on a mobile device.
Each of these Kali Nethunter alternatives offers distinct advantages, whether you're prioritizing a dedicated penetration testing suite, a highly customizable Android ROM, or an OS focused on privacy. Explore them to find the best fit for your mobile security and penetration testing needs.