The Heretic for the Macintosh page has a new release of Heretic for the Macintosh. The port is made from the source code recently released publically by Raven, and is said to be the equivalent of DOS Heretic verison 1.3. It requires a PowerMac and has been tested on System 7.5.5, 7.6.1 and 8.5.1., and it should work fine on System 7.1.2 and up. If you want to hear music, you need QuickTime 2.5 or later, and the optional MIDI files.