What are the best tools for converting speech to text?

What are the best tools for converting speech to text?

Wikipedia contains both a List of speech recognition software and Category:Speech recognition software.  CMU Sphinx – Speech Recognition Toolkit is likely the most popular among developers today.

See also my Quora answers to:

• How do I make a speech recognition system which executes my voice commands? Which language should I use for this?
• What open-sourced and accurate speech-to-text engines and APIs currently exist?