The Sphinx Group has been supported for many years by funding from the Defense Advanced Research Projects Agency, and the recognition engines to be released are those that the group used for the various DARPA projects and their respective evaluations.

LumenVox's Speech Recognition Engine (http://www.lumenvox.com/htm/products/speech_engine/main.asp)
A flexible API that performs speech recognition on audio data from any audio source. The Speech Engine is speaker and hardware independent: it supports SRGS and SISR on the Windows and Linux platforms.

The Speech Engine provides speech application developers with an efficient development and runtime platform, allowing for dynamic language, grammar, audio format, and logging capabilities to customize every step of their application. Grammars are entered as a simple list of words or pronunciations, or in the industry standard Speech Recognition Grammar Specification (SRGS), as defined by the W3C.

Synapse Adaptive (http://www.unixspeech.com/)
Synapse TAP Workstations offer an integrated cross-platform solution without the compatibility issues normally encountered in network, mainframe, emulations or Unix environments. TAP systems support Sun Microsystems, Silicon Graphics, HP UNIX, Macintosh, PC operating systems and mainframe environments.

Perlbox.org (http://perlbox.org/)
Perlbox.org provides voice solutions for Linux and Unix desktop control.