First there was Rogue, then Hack. The original Hack was Jay Fenlason's Hack, which apart from a few MS-DOS binaries, has largely been lost. It can be recompiled from sources at the NetHack archives.
Andries Brouwer later released his Hack on Dec 17 1984. The source code to Hack 1.0 preliminary version, can be found on the UTZOO archives, namely on tape news019f2.
Don Kneller, made many of the ports including PC-Hack to MS-DOS, and Hack-1.01 for the Amiga.
Hack had several updates through 1985, there was a 1.0.1, 1.0.2 and a 1.0.3
Then it later took on a life of it's own on the internet much like NetBSD as Nethack. You can find information here.