6502Em - A commerical BBC/Master/Compact/Electron emulator for RISC OS 3.1 or above. - http://www.borcherds.co.uk/murklesoft/riscos/6502em.html
The Acorn Preservation Project - Preservation of Acorn software, books, magazines and manuals, with the emphasis on faithful and accurate digital copies of the original cassettes, disks, packaging and documentation. - http://www.acornpreservation.org/
BBC Connect - A freeware Windows front-end for the BBC emulators BeebEm, B-Em, PcBBC and the Electron emulator ElectrEm. - http://ninsei.emuunlim.com/bbc_connect_info.html