A fully open source equivalent: <a href="https:&#x2F;&#x2F;github.com&#x2F;keredson&#x2F;DKO" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;keredson&#x2F;DKO</a><p>I wrote this for Two Sigma&#x27;s internal use back in 2010.