an iPad/iPhone app allowing a simple manipulation of letter spacing (or kerning), a text modification that has been shown to help dyslexic children to read more efficiently.
in English
http://itunes.apple.com/us/app/dys-help-people-with-dyslexia/id529867852?mt=8
in French
http://itunes.apple.com/fr/app/dys-help-people-with-dyslexia/id529867852?mt=8