When aD went under they open-sourced the project and it was renamed "Open Architecture Community System" or OpenACS.
Well no. Fortunately the ACS was always open source from very early
on; at least by 1998, possibly
as early as 1995.
That's how OpenACS was able to be created; first as a fork of
ACS to use PostgreSQL, and then with support for both databases
starting with version 4.x. The OpenACS project had been active for a
good while (years?) before aD went out of business.
