Mac OS X boot utility
XPostFacto is an open source utility for Mac OS 9 that enables the installation of PowerPC versions of Mac OS X up to Mac OS X v10.4 (Tiger), and Darwin on some PowerPC-based Apple Macintosh systems that are not officially supported by Apple. It was released in 2002.
Functions.
XPostFacto allowed Darwin, OS X, and OS X Server run on unsupported Mac models. The OS X Installer would not run on machines without a G3, G4, G5, or Intel processor by default, but XPostFacto patched the installer to allow it to run. A Mac OS 9 partition must be booted first. XPostFacto then runs in Mac OS 9 using an installation CD to install a version of OS X. 
XPostFacto is available for free, but the company offered support for either $10 or $25.
Supported models.
XPostFacto 4.0 works with pre-G3 Macintosh models. Beige box Power Macs as old as upgraded 7300-era machines are supported. Limited support was also available for Performa 6400 and 6500 models.
Reception.
Engadget gave XPostFacto a negative review for its slowness, stating it "runs like a limp turtle on our old iMac G3."
References.
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