At least the first four in the OS X 10.10 tree are apple original software, not just source dumps of other people's OSS products. Ok, that's terrible statistics

At least the first four in the OS X 10.10 tree are apple original software, not just source dumps of other people's OSS products. Ok, that's terrible statistics since the files are alphabetized and Apple comes early. But take a look through there at the copyright owners and you'll see lots of original software released as open source.