I&#x27;ve seen a few around.  Here&#x27;s one HN post that I can quickly recall - <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=9216299" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=9216299</a>