SheepShaver runs Mac OS Classic apps on Intel-based Macs

SheepShaver is an open source PowerPC MacOS run-time environment. That is, it enables you to run PowerPC Classic MacOS software on your computer, even if you are using a different operating system. However, you still need a copy of MacOS and a PowerMacintosh ROM image to use this program. SheepShaver is distributed under the terms of the GNU General Public License (GPL).

If you are using a PowerPC-based system, applications will run at native speeds (i.e. without any emulation involved). On other systems, SheepShaver provides the first PowerPC G4 emulator, though without MMU, to enable the execution of MacOS Classic. Performance with the current CPU emulator using basic just-in-time (JIT) translation techniques is roughly 1/8-th of native speeds.

The following platforms are currently supported: Linux (i386, ppc, x86_64), MacOS X (i386, ppc), Darwin, NetBSD 2.0, FreeBSD 5.3 and Windows for x86. An experimental port to MacOS X 10.4.4 for Intel is now available.

More info and download link here.

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