Version history

The current version (2006-08-10) is 0.4.43, available for VW in the Cincom public repository for VisualWorks.

An older version can be found at SourceForge, but the sourceforge version does not seem to be actively maintained.
A Squeak port maintained by Nevin Pratt can be found at http://www.smalltalkpro.com/squeakextras.html.
Presumably, there are other ports out there... somewhere?