It began as a commercial product. I thought it had been released as freeware a few years back. I saw it available as a download on EAB some time ago, but after telling you to search there, I can't seem to find it myself.
There was a thread here (Amiga.org) that gave the location on the site. Of course, if it was not legally given to the community, it was probably removed. It will pop up ebay.
Asim was the only CDFS that I could configure to go beyond 8.3 filenames.
Bedtime!