Amazon DSSTNE - https://github.com/amznlabs/amazon-dsstne
Google TensorFlow - https://github.com/tensorflow/tensorflow/
Microsoft CNTK - https://github.com/Microsoft/CNTK/
Facebook fbcunn - https://github.com/facebook/fbcunn/
They all utilize C++11 or later. Just as Hadoop pushed Java in the big data, map-reduce realm, I think these libraries will push C++11 in the Deep Learning realm.