I am looking for recommendations for an open-source (clinical) decision support system that is based on ANN (artificial neural network, deep learning) technology. I would like to use it for my own education, but the license should also be permissive enough to allow possible commercial use at a later time. A Java-based implementation would be best. I am thinking of something like the output of an ongoing or past research project at a well-respected institution. I am mainly interested in the decision engine, much less so (except by way of example) in any domain-specific knowledge.
I would suggest taking a look at SciKit learn - it is Python rather than Java but has a very permissive, (BSD), licence and is actively used, developed and supported. It is fully open source and free.