Nuance Communications' Dragon speech recognition software that includes an API. Formerly known as Dragon NaturallySpeaking (or Dragon Dictate for Mac), with separate "Pro" versions for including scripting capabilities and specialized vocabularies, the product now is known as Dragon Professional Individual (DPI - which includes scripting) or Dragon Professional Group (which adds networking and roaming profiles).
Dragon speech dictation software is popular in the medical and legal industries, and among those with RSI and other movement disabilities, and for technophile adopters who enjoy it for continuous speech to text transcription and command and control of system GUIs to replace using a keyboard and mouse.
Note, the "tag" name "naturallyspeaking" is an anachronism as the product is no longer called that, but rather, Dragon Professional Individual (DPI - which includes scripting) and Dragon Professional Group (DPG - which adds networking and roaming profiles, and the related DLG - adds legal vocab, etc.)