Apple is open sourcing Swift Build

Swift is a nice language. I'm glad to see it being released from the clutches of Apple. I can only imagine how large of a task this is. I hope some day to be able to use it. The last time I tried a cross-platform project with it I switched languages due to `URLSession.shared.data` (a network request) being unable to compile on Linux.

Is it really being released? Although some parts of the language and build chains are technically open source (as in, you can see the code), the project is still completely controlled by Apple at the top.