IBM ViaVoice - Control and development as it pertains to embedded processors remain in the hands of IBM. Linux, Mac OS, and Windows products were licensed to Nuance Communications (formerly ScanSoft) which has since discontinued the product. The Nuance website provides a list of which legacy systems can run the final versions.
MacSpeech Dictate - Mac OS X speech recognition using the Dragon NaturallySpeaking engine. This replaces MacSpeech's former iListen product which is based on Philips Speech Technology.
MicrosoftSpeech API - Speech recognition functionality included as part of Microsoft Office and on Tablet PCs running Microsoft Windows XP Tablet PC Edition. It may also be downloaded as part of the Speech SDK 5.1 for Windows applications, but since that is aimed at developers building speech applications, the pure SDK form lacks any user interface, and thus is unsuitable for end users.
PhilipsSpeechMagic - Market leader within the medical industry according to Frost & Sullivan, Philips SpeechMagic is a recognition engine that may be run either as a stand-alone product or integrated into other applications.
Apple Voice Recognition - Apple voice recognition is included in MacOs 9 and higher. It can be accessed as speakable items under OS9 and Speech Recognition under the speech control panel in OS X and higher. Apple's speech synthesis and recognition technology is collectivly called PlainTalk.
VERBIO ASR - Verbio is the market leader within Europe in speech technology as ASR, TTS or STT, specially in the latin languages: Spanish, Portuguese, Catalonian,etc. It may also be used without any previous training.