The Stack was a cracker and utility programmer for the Apple II.

The Stack might be credited with the first ever piracy packer. In the documentation for DDD Pro from 1987, Sound Wave writes,

"The History of Packing: In the beginning, most Apple programs were single files. In those days, all pirates had to do to upload and download programs was to call up an AE line and send the program across. But as software became more sophisticated, programs began to require full disks. To send an entire disk just could not be done with AE! So pirating software had to get more sophisticated to keep up with the new programs. At that point, the Stack (of Corrupt Computing) wrote his first Disk Splitter, which was a program that split a full disk into a sector map and 1-6 binary files. This made it possible to upload a full disk with AE by first splitting it, then unsplitting it back to its original state after downloading. Although this program ignored unused sectors, it did no data compression."