Pf9 was a port of some libraries and programs from Plan 9 from User Space (plan9port) to Windows, started in 2007. Initially based on cygwin, it later depended on MinGW only.
It is no longer actively maintained. Now that there has been Go around for some time, my need for the ported libraries has constantly decreased.
Though, sources still can be found at bitbucket.org.
A by-product of the work on pf9 is a port of plan9port's sam. Below a list of binary packages.
sam-20110504 (on Github)
This update fixes a problem with the previous distributions on a few Windows systems. Sam did not respond anymore as soon as a key got pressed.
sam-20090407.zip (1.1MB, sha1sum=54f79ed579dc82646b1225a4a6d1d059dd2ff4ff)
sam-20090403.zip (778KB, sha1sum=09c06199bba2aa63f7e8c59d70525e50dc378a93)