A free UNIX variant for the Macintosh maintained by Matt Slot.

Based on BSD4.4 and the Mach kernel, MachTen brings the power of UNIX to your desktop at an extremely attractive price point.

How to install NetBSD Unix on 68K Macintosh.

A site that is provided as a supplement to the official NetBSD webpages.

NetBSD ported to the Macintosh PowerPC platform. Supports machines with a PowerPC 604 or above and a PCI architecture.