FairIsle - Enables you to design Fair Isle knitting patterns, particularly suited for a knitting machine, but suitable for handknitting too. - http://www.apdl.co.uk/isv/fair.htm
ProSpur+ - Spur gear generator for use with ProCAD+. - http://www.dsnell.zynet.co.uk/PS/ProSpur.html
ProCAD+ - Professional CAD software, with a Lite version as well. - http://www.dsnell.zynet.co.uk/
RISC PCB - A freeware printed circuit board designer for RISC OS computers, available for download. - http://www.idealist.demon.co.uk/