The Free Software knew about 2 years ago 2 big revolutions: Ubuntu which made Linux known by people outside the community of computer-like, and development of graphical and accessibility solutions. If commercial software are very used today, it's because Free software didn't provide very credible friendly solutions until recently for a large public.

With solutions which have been developped for 2 years about, accessibility becomes interesting issue in developping software: help Free assistive technologies projects (in Python, in the kernel Linux...), make the work of such software easier in one's software, internationalizing software. For this, it's useful knowing how work assistive technologies, how some users see applications, and where finding help, testers, feedbacks, about accessibility/translation of his software or projects to join. If free software becomes accessible, it can be used by impaired people and become universal, useful for its promotion.