"Is it possible for software to be both commercially viable and
truly open source?
"Obviously your answer to this question will depend on what you
mean by those notoriously slippery words 'open source.' If you mean
'anything covered by the GPL' then the question is easy. Red Hat is
GPL'd, and no one can doubt that it's making money hand over fist,
therefore we can answer with a resounding 'yes' since at least one
famous example meets the condition..."