PDST - Public Domain SmallTalk
A highly inspiring and advanced derivation of the LittleSmalltalk system is PDST - Public Domain SmallTalk by Douglas E. Hemmond. It is based on LittleSmalltalk 3 and is in the public domain.
I downloaded a version (from 1999) on May, 06th 2007 from ftp://test.albemarle.cc.nc.us/pub/deh/pdst.
I found that link on versions/PublicDomainSmalltalk.html - but the other links there seem to be broken.
You can download the version I found here.
The PDST project seems to be dead and I could not get in contact with Douglas E. Hammond some years ago when I started with LittleSmalltalk. But PDST is still valuable and a great educational system.
Known derivations of PDST: Susie by Montgomery F. Tidwell.
If you know any other derivations or have further information about PDST or usages of it please let us know!