[tprynn]

EMR is just an automated way of deploying open source components (Hadoop and co.) - there's some glue code there but the equivalent "open" version is probably the Hortonworks stuff (now owned by Cloudera): https://github.com/hortonworks

[oogetyboogety]

This was pretty cool from Cloudera https://dzone.com/articles/large-scale-health-data-analytics...

[thinkmassive]

As someone who worked at Hortonworks back in the day, this is why I clicked through to find out what is OpenEMR, haha