Example applications
Want to see what a real live PWA looks like? Check out any of the following. A few also contain links to GitHub for you to view the source code.
PWA.rocks
A collection of Progressive Web Apps and source for most of the following. If you ever need inspiration, make this your first stop. I also encourage you to add any PWAs you add to the list.
One of the biggest players in the PWA space, Flipboard's PWA is slim, fast, and beautiful. Flipboard has a full-featured native application, but also a PWA in order to hedge their bets in terms of user preference. If the content-heavy Flipboard can manage the performance guidelines of PWAs, the sky is the limit.
React Hacker News
The ever-popular developer project: a clone of Hacker News, here using React. As an open source project, ReactHN is a great way to look into how to manage a complex frontend library with Progressive Web App fundamentals. Our good friend Addy Osmani is at work...