Thoth

Thoth is a speech recognition application that is based on the CMU Sphinx speech recognition engine. Thoth is still in a rudimentary state e.g. it does not allow voice training. In addition, CMU Sphinx is noticeably slow compared to commercial speech recognition software. It does not perform speech recognition while you are speaking. You must use cut & paste to copy text into documents. But... with a good microphone it can achieve somewhat decent recognition of standard English speech.