Crunchmania
An early-90s Amiga cruncher, liked for fast decrunching that worked as well on data files as on programs.
Crunchmania was written by Thomas Schwarz and arrived when the Amiga already had plenty of packers. What made it stand out was the balance: a decent ratio, but above all a decruncher fast enough to run mid-game or mid-demo without anyone noticing.
It could pack plain data files as well as executables, leaving games and demos to unpack them on load. The files are recognisable by their CrM header. Plenty of early-90s trackmos stored graphics and modules that way to fit an entire production on an 880 KB floppy.