I have a small role advising a company called Brand AI that makes a living brand style guide that hooks into tools. The cool thing is that you change a color value centrally and it will update in tools like Sketch, PowerPoint, Photoshop, and more while also spitting out a new Sass file for web developers. I like the idea of having centrally managed styles. I'd be curious to hear if they have plans to integrate with native mobile platforms and other tools as well, but the general concept is there!