FWIW I recently became aware of Pen:<p><a href="https:&#x2F;&#x2F;github.com&#x2F;UlricE&#x2F;pen" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;UlricE&#x2F;pen</a><p>I&#x27;ve not tried it - but there should be some overlap in use-cases, and it would appear to be a much smaller project than HAProxy.