Recently Mozilla released an open source implementation of Baidu’s DeepSpeech architecture, along with a pre-trained model using data collected as part of their Common Voice project.
In an attempt to make it easier for application developers to start working with the DeepSpeech model I’ve developed a GStreamer plugin, an IBus plugin and created some PPAs (plus a demo video):
http://blog.mikeasoft.com/2017/12/30/speech-recognition-mozillas-deepspeech-gstreamer-and-ibus/