Also check MxNet. I don't know enough of DNN to check if it's as powerful as Keras to build custom nets, but it's faster training the network and - for me - eas

Also check MxNet. I don't know enough of DNN to check if it's as powerful as Keras to build custom nets, but it's faster training the network and - for me - easier to install with CUDA and CNN support and has the big plus of being usable in R besides Python, Julia and Scala.