See http://portal.teco.edu/dspace/?q=en/technology-categories/accessible-graphics
AMChart Accessibility
This plugin provides accessibility enhancements for a very versatile chart library from amCharts.com. Once applied, the plugin enables navigation for keyboard users and provides the necessary support for screen reader users.
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Assets Chart Component / Chart.js
The charts widget from the Assets Framwork utilizes the Chart.js library to provide a fully responsive method for displaying a chart or graph. It is based on html tables and has no known accessibility issues
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Describler
Describler allows you to make your SVG images accessible and reusable. It shows you all of the text content of your SVG in an editable list, including both visible text and metadata, and makes it easy for you to add descriptive content, or change the text that's already there. And you can use the “audio preview” feature to hear how your SVG sounds in common screenreaders.
Describler also makes your SVG auto-scaling by default, rather than a fixed size; this allows you to use your SVG at whatever size you need, or to change the size dynamically, and it allows users to zoom and pan easily.
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SVG Sonification
Sonification of SVG charts and graphs via Web Audio and Speech APIs. Suports MathTrax. Abandoned project that needs some updating to work in current browsers.
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