Keras - Keras is a minimalist, modular neural networks library, written in Python and capable of running on top of either TensorFlow or Theano.
TFlearn - TFlearn is a modular and transparent deep learning library built on top of Tensorflow.
Clarifai - The World's AI
Microsoft Cognitive Toolkit (Formerly CNTK) - Machine Learning
Merlin - Merlin is a deep learning framework written in Julia, it aims to provide a fast, flexible and compact deep learning library for machine learning.
Knet - Knet is a deep learning framework that supports GPU operation and automatic differentiation using dynamic computational graphs for models.