SoftPear is a user mode Mac OS X emulator for Linux. As the news on our site say, we have just released a Preview Release that can run some Mac OS X command line tools in Linux and FreeBSD. (The download includes the GPL’ed source, binaries for Linux, FreeBSD and Mac OS X, some test programs and a README.) We do this by with our Mach-O executable loader, PearPC’s PowerPC interpreter core, and our libc wrapper. We hope to be able to run the complete Mac OS X “Quartz” UI on Linux, FreeBSD and Darwin/x86 one day, this way.