Hi David,
Following the aD debarcle they pretty much abandoned the TCL version in favour of an Java based ACS (which ain't worth mentioning as it just never got that far).
Thereafter the OpenACS community became the home for ACS TCL... In the last year or so its been ported so it now works on either oracle or postgres, allowing for a fully open source alternative.
Also, aD left that system in something less than an ideal state. I won't go over all that again :) but suffice to say that a lot of work has gone into this current version and its a great improvement.
As for packages and applications all are still there.
Cheers
Simon
