Kaldi is the best, there was just Tensorflow integration added which will hopefully speed up development (though I haven't seen any pretrained models for that yet).

Here's a blog post - http://www.googblogs.com/kaldi-now-offers-tensorflow-integra...

The easiest way to deploy Kaldi is this - https://github.com/alumae/kaldi-gstreamer-server (or a docker image of the that)