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. acornusers.org - Hosts the Acorn News Service, newsgroup archives, RC5/DES effort, Charity Site and an FTP server for freeware software distribution. My RISC OS - Automated web portal. Add news and reviews, and chat. 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. ANS Filebase - A categorised database with version information. Acorn User RC5/DES Group - Details of the cracking efforts. RISC OS webring - Provides free banner advertising of related websites. Acorn Charity Site - Fund-raising efforts. VirtualAcorn - The fully-functional RISC OS emulator for Windows-powered computers. Advantage6 - Design, manufacture and retail RISC OS electronic devices in the embedded and educational sectors. RISC OS Open - Offers access to the source code of the operating system, includes news, documentation and forums.