I believe this was already posted here some months ago:
75% of Linux code now written by paid developers
Quote:
18% of contributions to the kernel were made without a specific corporate affiliation, suggesting true volunteer efforts. An additional 7% weren't classified. The remainder were from people working for specific companies in roles where developing that code was a major requirement. "75% of the code comes from people paid to do it," Corbet said.
Within that field, Red Hat topped that chart with 12%, followed by Intel with 8%, IBM and Novell with 6% each, and Oracle 3%. Despite the clear commercial rivalry between those players, central kernel development worked well, Corbet noted.
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Why should Red hat, Intel, Novell, et. al. care about BSD portability? They are contributing code for their own selfish linux-centric reasons.