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Re:Linux is now hosted on GitHub by tonfa on Monday September 05, 2011 @01:42PM (#2962849)
The numbers for the kernel are well known (and they are hard to beat for any open source projects): https://lwn.net/Articles/395961/ (for every version ~1.1k devs and around 10k changesets)
Re:Linux is now hosted on GitHub by jgesture on Tuesday September 06, 2011 @06:43PM (#2967584)
Indeed. I don't recall the exact numbers, though I've heard both Linux and RoR numbers, I think that Linux has factors more developers committing to it than RoR.

Linux is, perhaps, the most rapidly changing piece of software in existence