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

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RISC OS Technologies

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.

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  • DownloadsROMs, the Frosted theme, HardDisc4, NetSurf, Iris and Viewer.
  • StatusCurrent and ongoing projects, and what is coming next.
  • DocumentsThe 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.
  • SearchSearch the web from an older browser, in plain HTML.
  • Kinetic BoxKinetic Box releases on GitLab.

Latest releases

RISC OS Viewer

Version 1.0.6 alpha298 KBUpdated 12 September 2026

Viewer opens documents and images on RISC OS. This alpha adds fixes to the PDF and PNG handling.

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
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NetSurf 3.12 (Frosted, 2026 certificates)

Version 3.12Updated 20 July 2026

NetSurf 3.12 development builds from the NetSurf test build site, unchanged apart from a certificate bundle generated from Mozilla's CA list. Build 7432 is the newer of the two; build 7429 also carries the bundled home page images.

Build 7432, June 20265.6 MBBuild 7429, April 20265.7 MB

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.

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All downloads

Get RISC OS One

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

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Programmer's Reference

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

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.

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