Don&#x27;t forget SystemML[1] and Singa[2], as well as venerable systems like Mahout[3] and SAMOA[4].<p>[1]: <a href="http:&#x2F;&#x2F;systemml.apache.org&#x2F;" rel="nofollow">http:&#x2F;&#x2F;systemml.apache.org&#x2F;</a><p>[2]: <a href="https:&#x2F;&#x2F;singa.incubator.apache.org&#x2F;" rel="nofollow">https:&#x2F;&#x2F;singa.incubator.apache.org&#x2F;</a><p>[3]: <a href="http:&#x2F;&#x2F;mahout.apache.org&#x2F;" rel="nofollow">http:&#x2F;&#x2F;mahout.apache.org&#x2F;</a><p>[4]: <a href="https:&#x2F;&#x2F;samoa.incubator.apache.org&#x2F;" rel="nofollow">https:&#x2F;&#x2F;samoa.incubator.apache.org&#x2F;</a>