In TidBITS this week (TidBITS is a well-respected weekly Macintosh
news magazine distributed via e-mail):

  If neither MkLinux nor linux-pmac capture your fancy, two other
  non-commercial Unix-like operating systems are available for the
  Mac, NetBSD (formerly MacBSD) and OpenBSD. These work on some Mac
  models and are available on CD-ROM for $35 and $30 respectively.
  If you'd like to consider a commercial alternative, check out the
  highly regarded MachTen from Tenon Intersystems. [Tenon also
  recently created WebTen, a Mac application combining Tenon's Unix
  technology with the popular Apache Web server. -Adam]
 
<http://www.netbsd.org/>
<http://www.openbsd.org/>
<http://www.tenon.com/>

...

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