XVoice provides voice control of X applications using IBM's ViaVoice for Linux (free download at their web site). Both user-defined commands and dictation are supported. It can be used to write letters, write code, control netscape, etc.
Tcl/SMAPI is a Tcl extension library that makes possible the use of the IBM Speech Manager Applications Programming Interface (SMAPI) in Tcl scripts. SMAPI is the connection between the user interface and the speech recognition engine for the IBM ViaVoice