RISC OS One

RISC OS, frosted — ROMs, desktops and documentation from RISC OS Technologies

News Downloads Library Forums Bugs
Account
RISC OS One

RISC OS, frosted

RISC OS One brings the Frosted desktop to RISC OS 5 — ready-made ROMs for Raspberry Pi, Iyonix, iMX6 and Titanium, a matching HardDisc4 image, and web browsers with up-to-date certificates.

Get RISC OS One Open the Library

Find your way

  • DownloadsROMs, the Frosted theme, HardDisc4, NetSurf, Iris and Viewer.
  • LibraryThe RISC OS 5 Programmer's Reference Manuals and RISC OS One guides.
  • ForumsAsk questions and share what you're building.
  • NewsRelease notes and announcements.
  • BugsReport a problem with a RISC OS One release.
  • Kinetic BoxKinetic Box releases on GitLab.

Latest releases

RISC OS Viewer

Version 1.0.4 alpha312 KBUpdated 24 August 2026

The first alpha of Viewer, which opens documents and images on RISC OS.

FiletypeTypeHow it draws
PDF&ADFNative engine
JPEG&C85c/pdfjpg
PNG&B60c/pdfpng
Draw&AFFDrawFile_Render
BMP&69Cc/pdfbmp
GIF&695c/pdfgif
TIFF&FF0c/pdftiff
Photoshop&1B0Flattened composite
ArtWorks&D94Native walk to Draw
Impression&BC5Text preview
Ovation Pro&B27Text preview
Ovation&CDDText preview
Impression DDF&D93Text preview
Ovation Pro DDL&B25Text preview
Sprite&FF9SpriteOp 52
Download

NetSurf 3.12 (Frosted, 2026 certificates)

Version 3.1211.4 MBUpdated 20 July 2026

The NetSurf 3.12 development build from the NetSurf test build site, unchanged apart from an updated certificate bundle generated from Mozilla's CA list.

Download

Raspberry Pi — RISC OS One Frosted ROM

Version 4.09107.8 MBUpdated 1 June 2026

The RISC OS One ROM for Raspberry Pi, with the new RISC OS One branding. Version 4.09 bundles a HardDisc image and wallpapers.

Download

All downloads

Get RISC OS One

Frosted ROMs for Raspberry Pi, Iyonix, iMX6 and Titanium, plus the HardDisc4 image and the Frosted theme.

Browse downloads

Programmer's Reference

Find the RISC OS 5 Programmer's Reference Manuals and RISC OS One guides in the Library.

RISC OS Technologies

RISC OS One is built and maintained by RISC OS Technologies. About us · Contact

RISC OS IPR

RISC OS is an open source operating system owned by RISC OS Developments Ltd and licensed primarily under the Apache 2.0 licence.

Contact us  |  About us  |  Licences

Site design © RISC OS Technologies 2026 except where indicated

Built on Ruby on Rails