WebKit, Swift, LLVM, that's it really. Relative to marketcap, Apple open sources the least, probably even less than Oracle, Intel, and friends. Swift and LLVM b

WebKit, Swift, LLVM, that's it really. Relative to marketcap, Apple open sources the least, probably even less than Oracle, Intel, and friends. Swift and LLVM benefit from being open source--it would actually be unusable if it weren't. None of the things which give them market share like iMessage or their chip designs are remotely open source. It doesn't compare at all to Google's open source which includes Chromium, the entire Android operating system, Bazel, protocol buffers, Go--too many to list.