EMACSPEAK

To grasp the accessibility benefits of Linux’s text-only interface, a look at Emacspeak should be taken .Emacspeak a speech interface enables visually impaired computer users to work independently and efficiently with the computer.
Emacspeak perfectly exemplifies the leveraging that's possible by making use of Linux's fully developed text-only environment. Emacs is far more than a text editor; over the years, it has acquired so many accretions that it can function quite nicely as a mail reader, calendar and scheduling program, Internet browser, and much more.
Emacspeak gives Emacs the consistent keyboard input design that people with limited vision require, and its consistent, comprehensive implementation of speech synthesis doesn't leave users in the lurch. With Emacspeak, people with limited or no vision can quickly become successful and competent users of e-mail, the Internet, and text-based documents. Emacs can also function as a text-based interface to the bash shell, which means that users can harness the full power of thousands of console mode programs and utilities.