svn co http://piumarta.com/svn2/idst/trunk idst or here
Last update appears to be 2007 but some interesting ideas appear to be buried here:
There is some (often slightly stale, or at the very least incomplete) documentation available for: the id-based object language; the 'pre-scheme'-like function language; the theory of how the two complement and complete each other as a COLA; the id object model on which it is all based; a trivial extension that adds support for Leiberman prototypes to the id object model; an evolving device-independent canvas abstraction and its superjacent UI model.
As of 5 Oct 2020, download still works--should grab and explore.
Last modified 22 June 2021