lichess.org and the corresponding open source project[1] are really quite something. If you're at all interested in chess or code, I recommend following it -- their great execution will inspire you.
This may sound naive, but what are the incentives and/or how are the developers of Lichess making a profit. The site is one of the best executed webapps I've ever used. What motivates the creators?
[1] https://github.com/ornicar/lila