Published at LXer:

Most assistive technology software is not cross platform because it is often closely integrated with the operating system and screen display sub-systems. Commercial developers also face the challenge that the potential user base is not large, so prices can be high, which restricts the user base even more. Open source and freeware developers have more freedom in developing assistive technology projects, but to be successful they still need to achieve a critical mass of users. One way to tackle this problem is to expand the user base to include communities across the world that cannot afford the high prices of commercial assistive technology software.

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