RISC OS

Acorn Charity Site
Fund-raising efforts.
http://www.acornusers.org/charity-projects/

Acorn User RC5/DES Group
Details of the cracking efforts.
http://www.acornusers.org/rc5/

acornusers.org
Hosts the Acorn News Service, newsgroup archives, RC5/DES effort, Charity Site and an FTP server for freeware software distribution.
http://www.acornusers.org/

Advantage6
Design, manufacture and retail RISC OS electronic devices in the embedded and educational sectors.
http://www.advantagesix.co.uk/

ANS Filebase
A categorised database with version information.
http://filebase.acornusers.org/

ArcSite
German portal. Offers news, articles, forum, links and web space.
http://www.arcsite.de/

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.
http://www.castle-technology.co.uk/

My RISC OS
Automated web portal. Add news and reviews, and chat.
http://www.myriscos.co.uk/

Nutshells
Categorized and cross-referenced database of shareware/freeware and software authors, with a broader database of companies and information.
http://nutshells.anjackson.net/

RISC OS 3 Knowledge Base
Official site providing support for earlier versions of the operating system.
http://acorn.riscos.com

RISC OS webring
Provides free banner advertising of related websites.
http://www.vigay.com/cgi-bin/webring?ring=riscos

RISCOS.org
Portal offering news and articles. It includes a software database.
http://www.riscos.org/

Select Scheme
Yearly subscription to updated versions of RISC OS.
http://www.riscos.com/select/

VirtualAcorn
The fully-functional RISC OS emulator for Windows-powered computers.
http://www.virtualacorn.co.uk/