San Francisco family (SF family)
All of the fonts in San Francisco font family, developed by Apple. Including the new serif fonts found in the Apple Book app on iOS 12.
Compatible with Windows.
For SF Hello font, currently it is impossible to obtain it can be obtained only if you are an Apple employee or an authorized Apple reseller.
License
Apple fonts are not meant to be used for commercial purposes outside Apple products. More information can be found here.
For the SF Mono typeface, you are allowed to use it only in Xcode, Terminal.app and Console.app.
For the SF Serif typeface, your use of this font is subjected to terms of the applicable iOS/macOS/tvOS/watchOS Software License Agreement.
Preview the fonts
You can visit https://windyboy1704.github.io/San-Francisco-family/ to try out the fonts.
SF Hello
This is a rare typeface that only appears in internal Apple presentation PDFs, unfortunately it is subset embedded so I cannot extract the full font data. In order to obtain SF Hello, you must be a member of Apple Sales Website - which is impossible for regular users.
I managed to extract some of its subset and converted to OpenType. My plan is to take all of its weight variant (Bold, Semibold, Medium, Light), then I will do a comparison between SF (or SF Pro in this repository) and SF Hello. At first glance, they are quite simillar, only different in kerning. For now, SF Hello is a mixture of SF Display and Text.
Credits
MDN web docs for the font choosing demo code.