RISC OS Open (ROOL) is an organisation run on a largely voluntary basis. We are managing the process of publishing the source code to RISC OS, which can be found here. We also offer professional services to anyone who is interested in developing commercial products using RISC OS. RISC OS is a computer operating system designed in Cambridge, England by Acorn Computers. First released in 1987, its origins can be traced back to the original team that developed the ARM microprocessor. RISC OS is owned by Castle Technology Ltd.