Distros

RefreshOS is a user-friendly Linux distribution based on Debian's "Stable" branch and featuring the KDE Plasma desktop. Some of its main features include extended driver support, a polished user experience, and a refined system performance. The distribution ships with the Brave web browser, LibreOffice office suite, GIMP image editor and various popular applications for productivity and creativity tasks. RefreshOS maintains a clean environment that is free of Snap and Flatpak packages.

Regata OS is a Brazilian Linux distribution based on openSUSE, focusing on desktop and gaming needs. Its main characteristics include a Regata OS store for installing applications and games, out-of-the-box integration with Google Drive, support for a gaming mode via the Vulkan graphics API, an extensive library of games in the Regata OS Game Access portal, support for configuration of hybrid graphics in notebooks, and easy transfer of files between a computer and a smartphone. The distribution's user interface is KDE Plasma.

RELIANOID is a Debian-based Linux distribution for load balancing. The project offers a specialist operating system for testing, development and quality assurance environments. Relianoid is available in Community (free of cost) and Enterprise editions.

Rescuezilla is a specialist Ubuntu-based distribution designed for system rescue tasks, including backups and system restoration. It was forked from the "Redo Backup & Rescue" project which was abandoned in 2012. Like its predecessor, it allows a "bare-metal restore" after any hardware failure directly from the live image. Some of the features include: works directly from the live CD/USB image; works with Linux, macOS and Windows; automatically searches a local area network for drives to backup to or restore from; recovers lost or deleted data files; includes configuration tools for managing disk and drives. Rescuezilla uses a simplified LXDE user interface.

Rhino Linux is an Ubuntu-based distribution which offers a rolling-release upgrade approach. The distribution uses a customised Xfce desktop environment. Rhino features a custom meta package manager which unifies Deb, Pacstall and Flatpak software management.

RISC OS is a computer operating system originally designed by Acorn Computers Ltd in Cambridge, England in 1987. RISC OS was specifically designed to run on the ARM chipset, which Acorn had designed concurrently for use in its new line of Archimedes personal computers. It takes its name from the RISC (reduced instruction set computing) architecture supported. Fast, compact and efficient, RISC OS is developed and tested by a loyal community of developers and users. RISC OS is not a version of Linux, nor is it in any way related to Windows, and it has a number of unique features and aspects to its design.

Rockstor is a specialist openSUSE-based Linux distribution designed for Network Attached Storage (NAS) and private cloud storage solutions. It is based on popular open-source technologies, such as the Btrfs file system and Docker for automating the deployment of applications inside software containers. In addition to standard NAS features like file sharing via NFS, Samba, SFTP and AFP, advanced features such as online volume management, CoW Snapshots, asynchronous replication, compression, and bitrot protection are also supported. Rockstor provides additional applications, including ownCloud, Syncthing, OpenVPN and Plex. These applications (called "Rock-ons") are powered by a Docker-based application hosting framework. The Rockstor user interface, written in JavaScript, makes it simple to manage the server from within a web browser.

ROSA is a Russian company developing a variety of Linux-based solutions. Its flagship product, ROSA Desktop, is a Linux distribution featuring a highly customised KDE desktop and a number of modifications designed to enhance the user-friendliness of the working environment. The company also develops an "Enterprise Server" edition of ROSA which is based on Red Hat Enterprise Linux.