Thanks for the pointer, anyway! .xm seems to be a real obscurity.
One longstanding complaint about Macs back in the Classic days was that, compared to Windows or (of course) Linux, there wasn't a lot of free software for them (either as in beer or as in speech); almost everything was distributed via the shareware model if it existed at all. There's nothing inherently wrong with shareware (in my opinion), but there was a definite cost differential if you really paid for licenses. But Mac OS X has led to a real explosion of free software ports that were too difficult to bother with before, either as X11 apps or as real Cocoa ports.
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One longstanding complaint about Macs back in the Classic days was that, compared to Windows or (of course) Linux, there wasn't a lot of free software for them (either as in beer or as in speech); almost everything was distributed via the shareware model if it existed at all. There's nothing inherently wrong with shareware (in my opinion), but there was a definite cost differential if you really paid for licenses. But Mac OS X has led to a real explosion of free software ports that were too difficult to bother with before, either as X11 apps or as real Cocoa ports.