I switched to BeOS on my Motorola StarMax when it got stable around the second release and used it as my primary OS for quite awhile (all the way through version 5 when I switched to x86).  I had tried MkLinux, but was using MachTen before that.  I had used MachTen on 68k and it was rock solid, I never had the same luck with the PowerPC version.  I honestly can&#x27;t remember why I didn&#x27;t stick with MkLinux.  Much later I ran YellowDog on my G3 machines.<p>EDIT: I&#x27;m thinking back... I was pretty young at the time 14-15 yo. And just learning to program, and what I really loved about BeOS was how easy the API was to learn.  I had been learning C&#x2F;C++ in MachTen and never could wrap my head around making Machintosh GUI applications.  But sitting down with the Online documentation in BeOS, it was <i>VERY</i> easy to make a program with 3D graphics and a native GUI.  Later on, QNX gained a lot of popularity I think for the same reasons (fantastic documentation and API).  I had worked on a project under Solaris which relied on POSIX.4 extensions (yikes) before moving it to QNX.