Many parts of the Swift toolchain are already open source [1], there is a Windows and even a WASM port [2]. The caveats are: - Xcode indeed isn’t, but you can

Many parts of the Swift toolchain are already open source [1], there is a Windows and even a WASM port [2]. The caveats are: - Xcode indeed isn’t, but you can use sourcekit-lsp for Swift development with some compromises. The experience has really improved the last few months thanks to the Swift Server Work Group [3]. - Apple platforms have their own Foundation implementation and the open-source one is incomplete. [1]: https://www.swift.org/source-code/ https://www.swift.org/source-code/ [2]: https://swiftwasm.org/ https://swiftwasm.org/ [3]: https://www.swift.org/blog/vscode-extension/ https://www.swift.org/blog/vscode-extension/