1. Ubuntu Touch

  2. LineageOS: A free and open-source operating system for smartphones and tablets, derived from the popular custom ROM CyanogenMod. It is known for its privacy and security features, lightweight nature, and lack of ads and tracking. LineageOS is highly customizable and supports a wide range of devices.

  3. GrapheneOS: A privacy and security-focused mobile OS with Android app compatibility. It emphasizes research and development in privacy and security technologies, offering features like over-the-air (OTA) updates, no tracking, and ad-free usage. It is particularly suitable for users who prioritize security.

  4. /e/ (formerly eelo): A fork of LineageOS that aims to be completely free of Google services. It focuses on user privacy and simplicity, integrating features like Nextcloud for cloud sync and being ad-free. It provides a de-Googled experience while maintaining compatibility with Android apps.

  5. CalyxOS: Another privacy-focused mobile OS designed to prevent tracking by governments and corporations. It offers features like OTA updates, ad-free usage, and no tracking. CalyxOS is built on the Android Open Source Project (AOSP) and includes additional security enhancements.

  6. Replicant: A fully free Android distribution emphasizing freedom, privacy, and security. It replaces or avoids every proprietary component, making it a strong alternative for users who value software freedom. Replicant is focused on providing a completely open-source mobile experience.

  7. Sailfish OS: Developed by Jolla, Mer, the Sailfish Alliance, and community members, Sailfish OS is a continuation of the MeeGo OS. It offers Android app support and Microsoft Exchange compatibility. Sailfish OS is known for its smooth performance and unique user interface.

  8. Plasma Mobile: An open-source user interface for mobile devices developed by the KDE community. It transforms phones into fully open hacking devices, similar to PCs, and is privacy-focused and ad-free. Plasma Mobile is built on top of the KDE Plasma desktop environment.

  9. postmarketOS: Extends Alpine Linux to run on smartphones and other mobile devices. It is security-oriented, lightweight, and privacy-focused. postmarketOS aims to provide long-term support and is suitable for users who want a Linux-based alternative to Android.

  10. Mobian: Known as “Debian for Mobile,” Mobian is available for phones and tablets and is based on Debian. It aims to bring the stability and reliability of Debian to mobile devices.

  11. Manjaro ARM: An ARM version of the Arch Linux-based Manjaro distro, utilizing the Plasma Mobile interface. It supports desktop Plasma apps and widgets, as well as Ubuntu Touch apps. Manjaro ARM is known for its rolling release model and user-friendly experience.

  12. Arch Linux ARM: Similar to Manjaro ARM, this distro also uses the Plasma Mobile desktop and is suitable for devices like the PinePhone and PinePhone Pro. It provides a highly customizable and lightweight environment.

  13. openSUSE: Utilizing a rolling release system, openSUSE Tumbleweed is available for the PinePhone. It uses the Plasma Mobile interface and supports a wide range of apps for an open-source mobile experience. openSUSE is known for its robust package management and stability.