Here is a nice guide put together by JISC in the UK. It’s a guide of Free and open source software (FOSS).
Many FOSS tools can benefit learners and those with (or without!) a disabilities. There are thousands of tools available.
On the guide the tools have been grouped by type so that they may be of benefit for specific purposes or needs. For example Audio tools to enable you to record and/or listen to material or Display enhancement tools to need help with either displaying or working with text and graphics.
Before downloading any free and open source software we recommend keeping your computer secure using antivirus software.
For other useful resources in Jisc see their blog page