Microsoft has made public a beta release of their SFU product – this incorporates Interix, which itself is a POSIX abstraction layer, emulating various functions that most UNIX flavors support, kind of similar to Cygwin – only in an entirely similar, yet different manner.

This beta includes X11R6, gcc 3.3, and a few daemons. I’ve already got OpenSSH and zsh running, and am currently working on porting a few of my utilities to ensure compatibility – it’s faster than Cygwin, for one, and two, commercially supported. ;)