CNTK 2.0. Nice production-related features, note Model Compression, Keras support and impressive multi-GPU scaling.

> If your project involves sequence processing, such as speech, natural language understanding, machine translation, etc., CNTK should be your best choice. And if you are a vision researcher working on video processing, you should definitely give CNTK a try.

https://www.microsoft.com/en-us/cognitive-toolkit/blog/2017/06/microsofts-high-performance-open-source-deep-learning-toolkit-now-generally-available/