added link to robobraille

accessibility-of-documents/accessibility-overview.md

@@ -44,4 +44,10 @@ The table below shows a mapping between document types, standards and technologi
 | ppt(x)        	|                                                                 	|                                                     	| Office 365 integrated     	|
 | Web           	| [WCAG](https://levelaccess.zoom.us/recording/play/NjAwLUmOM5lEPtGYPxls_ov6H1kNqwpz4r0W-hk5WzRAN76IV3EL1h8XWyZIYeWl?startTime=1537379538000), [WCAG webinar](https://levelaccess.zoom.us/recording/play/NjAwLUmOM5lEPtGYPxls_ov6H1kNqwpz4r0W-hk5WzRAN76IV3EL1h8XWyZIYeWl), [WAI-ARIA](https://www.w3.org/WAI/standards-guidelines/aria/), [ARIA authoring practices](https://www.w3.org/TR/wai-aria-practices/),...                                             	|                                                     	|                           	|
 | [moodle-content](https://moodle.org/)        	|[accessible course design](https://docs.moodle.org/35/en/Accessibility#Conformance_to_standards)                                                                 	|                                                     	|                           	|
-| [Latex](https://www.latex-project.org/)         	|                                                                 	|                                                     	|                           	|
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+| [Latex](https://www.latex-project.org/)         	|                                                                 	|                                                     	|                           	|
+
+# Generic conversion technologies
+
+In case of non-accessible documents there are frameworks and services trying to convert a given document to an accessible output format of choice.
+
+* [robobraille.org](http://www.robobraille.org/)
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