Emacspeak is a free computer application, a speech interface and an audio desktop (as opposed to a screen reader) employing Emacs, which is written in C, Emacs Lisp and Tcl and developed principally by T. V. Raman (himself blind since childhood, and who has worked on voice software with Adobe Software and later IBM) and first released April 1995; it is portable to all POSIX-compatible OSs.