One point I'm concerned about is, for example, libdispatch. As you may know, that is the basis for concurrency with methods such as dispatch_async... If you look at its open source page on macforge it hasn't been updated in about 3 years. The bugtracking system is a wasteland of spam. The status of mdnsresponder isn't really any better. I don't know of any other repository that apple would be using for these projects. A github search yields a collection of unofficial repos of variable recency and relevance.I love swift, and I'm eager to let my C skills atrophe, but I'm pretty worried about the level of support that the open source port will get. I'm feeling like it's going to just sit around and rot. 😟 Even if the language itself is updated (the LLVM/CLANG teams seem to do better) the other stuff that will make it useful, like libdispatch, will be severely limiting. Remember that without Foundation, the swift standard library can't really do anything.