A Tale of Four Kernels
http://www.spinellis.gr/pubs/conf/2008-ICSE-4kernel/html/Spi08b.html Quote from the article: “Therefore, the most we can read from the overall balance of marks is that open source development approaches do not produce software of markedly higher quality than proprietary software development.” A subjective code quality study for linux, windows, solaris and freebsd operating systems kernels