It depends on which Free Software. The paper doesn't really makes an apples-to-apples comparison sadly. GNU has always been the open source flagship. Comparing

It depends on which Free Software. The paper doesn't really makes an apples-to-apples comparison sadly. GNU has always been the open source flagship. Comparing GNU to SGI is like comparing Google to Yahoo. It'd be more apt to compare the reliability of GNU tooling to the AT&T PSTN.