Tierra was interesting, but these days I would point anyone interested in that direction instead at Avida and BEACON.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Avida" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Avida</a><p><a href="http:&#x2F;&#x2F;beacon-center.org&#x2F;welcome&#x2F;" rel="nofollow">http:&#x2F;&#x2F;beacon-center.org&#x2F;welcome&#x2F;</a><p>In particular this was a surprisingly interesting overview of their recent work:<p><a href="http:&#x2F;&#x2F;beacon-center.org&#x2F;wp-content&#x2F;uploads&#x2F;2014&#x2F;10&#x2F;BEACON2014AnnualReport_Public.pdf" rel="nofollow">http:&#x2F;&#x2F;beacon-center.org&#x2F;wp-content&#x2F;uploads&#x2F;2014&#x2F;10&#x2F;BEACON20...</a>