Welcome
Who are RISC OS Open Limited?
RISC OS Open Limited (ROOL) manages the source code to RISC OS. We are an organisation run on a largely voluntary basis. We also offer specialist professional services to anyone who is interested in developing products around the Arm architecture or RISC OS. You can find out more information about us here.
Find out about the RISC OS Moonshots initiative here.
What is RISC OS?
RISC OS is a computer operating system designed in Cambridge, England by Acorn. First released in 1987, its origins can be traced back to the original team that developed the Arm microprocessor. You can find out more at sites such as riscos.info, The Icon Bar and RISCOSitory. Also take a look at the printed RISC OS magazine, Archive, first published in the same year as the Arm launch, or the digital publication Drag N Drop for in-depth reviews and articles.
If you are new to RISC OS you might want to look at the introductory pages in our wiki, or come along to one of the shows and user groups.
Latest news
- Episode IV – A New Hope (20-Nov-2025)
- London is closer than you think (23-Oct-2025)
- Streaming Video in 1994? (05-Aug-2025)
- Pi memory freed from its 32 bit shackles (18-Jul-2025)
Recent changes in GitLab
- Pushed to branch master in InetRes (ROOL) – Updated trusted root CA data (07-Nov-2025)
- Pushed to branch master in Paint (ROOL) – Allow outline fonts to be used with the text painting tool (01-Nov-2025)
- Pushed to branch master in BuildSys (ROOL) – Add a components definition for libraries in the DDE built as APCS-R (23-Oct-2025)
- Pushed to branch master in Env (ROOL) – Path addition for Fortran (23-Oct-2025)
