release 1.1.4 (source tarball only)
Precompiled binary for Win32 with cygwin1.dll (required)
Precompiled binary for NeXT - compiled by Jerome Vernet
The original UnixNPI was written by Richard C.I. Li of the Hong Kong NUG (Newton User Group). He released the source under the GPL after being asked by Chayim Kirshen on the linux-ppc mailing list. Chayim passed the source off to me, with a promise that I would set up a Sourceforge project and the like.
The project page at SourceForge