OpenOffice has support for various Accessibility aspects.
Keyboard navigation, scheming, AT support and much more. Details can be found here: https://ui.openoffice.org/accessibility/whitepaper.html.
If you want to find out if your AT works with OpenOffice, or how to configure OpenOffice to be used with an AT tool, you can have a look into https://wiki.openoffice.org/wiki/Accessibility.
There is a mailing list which can be used for user questions and
comments, as well as for developer related things. Please subscribe
The OpenOffice Accessibility Project
More details about all Accessibility related things around OpenOffice can be found in the OpenOffice Accessibility Project and in the OpenOffice Wiki: