I would love to check out touchdesigner some day, I'm a Houdini pipeline TD (and creative too) and Touch started as a fork of Houdini from quite some time ago specialised for real-time (and the real-time-ness of demoscene is one of my favourite things ever!) However iiuc Touch is Windows-only.

I wonder whether under wine it might benefit from the 'ntsync' thing that just got added to the Linux kernel (as a module) (Currently also on hn front-page) as long as there's a free training version of Touch I'll definitely check it out once the new kernel gets into Gentoo!