SpaceManager, from Vertisoft, the authors of DoubleDisk which became Microsoft
DoubleSpace, is a utility that adds more features to DoubleSpace. It
adds access to additional compression methods to get better
compression at the expense of CPU speed, can bypass compression for
files that do not compress well, automatically schedule a drive
recompression, automatically mounts compressed floppy disks, and
shows drive usage details and compression statistics.