Ask HN: What open source project, in your opinion, has the highest code quality?
with respect to the C++ Language: 
there was a book published in 1996.  Large-Scale C++ Software Design by John Lakos.  He's about to publish the second edition of the book while also expanding it's reach to span two volumes.<p>Anyhow, while we await the publication of that book, John has been working at bloomberg.  some of the code written there has been published to github[1].  He's also done a five hour lecture series [2] available on safari-online (paid service) that cover the topics of his book, and introduce the open source bloomberg repo as an example of code written in that style.<p>I can't offer you a review as I've just found this all myself, but I'll be eagerly studying it along with some of the other items mentioned here.<p>[1] <a href="https://github.com/bloomberg/bde" rel="nofollow">https://github.com/bloomberg/bde</a>
[2]<a href="https://www.safaribooksonline.com/videos/large-scale-c-livelessons-workshop/9780134049731/" rel="nofollow">https://www.safaribooksonline.com/videos/large-scale-c-livel...</a>