Feren OS is a desktop Linux distribution based on Ubuntu and featuring the KDE Plasma desktop. It ships with a tweaked Calamares system installer, a custom theme and fonts, the Vivaldi web browser, boot options for advanced users, and a Feren OS Tour application, among the many home-built features and improvements. Prior to November 2020, the distribution was based on Linux Mint and included an edition with the Cinnamon desktop.