Max/MSP, some C/C++. All sound related, that I know of. He used to spend a lot of time online. Much more than he lets on. I don't know what he's doing now -- immersed in family and normal life stuff, I reckon.
I don’t think I ever came across any code that was accredited to Richard. Definitely remember some max/msp patches throwing the Autechre name around. Still love the supercollider bbcut libraries, Nick Collins definitely knew what the rephlex folks were up to :D
