[ale] Alternative to splunk?

[jdp at algoloma.com (JD)]

I'm looking for a F/LOSS alternative to splunk.  Not interested in SaaS.

What do you use?
Something like Elasticsearch, Kibana, an Fluentd all working together?
http://docs.fluentd.org/articles/free-alternative-to-splunk-by-fluentd

or

something else?
http://devopsangle.com/2012/04/19/8-splunk-alternatives/