| acornusers.org | | Hosts the Acorn News Service, newsgroup archives, RC5/DES effort, Charity Site and an FTP server for freeware software distribution. |
| Advantage6 | | Design, manufacture and retail RISC OS electronic devices in the embedded and educational sectors. |
| ANS Filebase | | Comprehensive categorised database, with version information. |
| ArcSite | | German portal. Offers news, articles, forum, links and web space. |
| Castle Technology | | Owner of the RISC OS copyright, they also manufacture, distribute and develop of Acorn Computers, as well as the acclaimed new Iyonix PC. |
| Drobe Launch Pad | | The launch pad to the net for RISC OS users worldwide. Portal including Acorn, ARM, technology and general news. |
| My RISC OS | | Automated web portal. Add news and reviews, and chat. |
| Nutshells | | Categorized and cross-referenced database of shareware/freeware and software authors, with a broader database of companies and information. |
| RISCOS Ltd | | RISC OS developers - the world's first 32-bit RISC operating system - used in Acorn, Advantage Six, Microdigital and RiscStation computers. Site has content for developers, resellers and the public interested in using this ROM-based, low-overhead, operating system. |
| RISCOS.org | | Portal offering news and articles. It includes a comprehensive software database. |
| Select Scheme | | Yearly subscription to updated versions of RISC OS. |
| VirtualAcorn | | The fully-functional RISC OS emulator for Windows-powered computers. |
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