3 ms·Swift is open source as of WWDC, and Microsoft is working on bringing Swift on as part of this project.by partiallypro 11y agoSwift is open source as of WWDC, and Microsoft is working on bringing Swift on as part of this project.pilif 11y agoIt's not. It's only promised to be. Kinda like FaceTime was promised to be an open standard.rimantas 11y agoUnlike Facetime nobody rised patent issues regarding Swift.