They used to have a port of Safari for Windows. It was as popular as you'd expect. Having said that, WebKit - the engine underpinning Safari - is open source with BSD and LGPL 2.1 compatible licensing (https://webkit.org/project/). In addition, they make the engine available for use on Linux (https://webkit.org/downloads/). Gnome Epiphany is a browser based on WebKit (https://github.com/GNOME/epiphany). According to their manifesto, they support Simplicity, Standards Compliance and Software Freedom. Specifically, "Epiphany opposes the dominance of the web by proprietary software web browsers. Today's chief offender is Google Chrome, a browser that purports to be open source, yet actually includes several proprietary components." https://github.com/GNOME/epiphany