CSJ wrote on the debian-user mailing list:
For helping teach my kid to read I used emacs running emacspeak. The robotic language, via the eflite speech synthesis server, was sufficient to get the words' pronunciation across. Type "D-O-G-Short URL: http://sachachua.com/blog/p/1205
" in a buffer and you get the audio feedback "dog." I used to set the xterm to the most massive font size available (by adjusting the font and screen sizes) to make reading, or so I assumed, easier for preschool eyes.