I am a blind undergraduate math student. I use screen reader software, which uses text-to-speech to read aloud the contents of the screen, to read and write math.
Due to the limitations of presentation formats such as PDF and MathJax, screen readers cannot properly handle most of the mathematical content they contain.
This means that for the most part, I can only correctly access mathematical documents in their source format, like LaTeX; this considerably limits the resources available to students.
Fortunately, there are some excellent online math resources that include content sources, like Wikipedia and NLab, but sometimes they are not enough on their own to learn a subject well.
Sometimes I have had the chance to reach out to kind teachers and publishers about particular textbooks, which they have been able to provide in source format;
but in general it is very difficult to find other good learning resources available as a source.
Another good resource is Arxiv, which often allows you to download the source of an article, but it is very difficult to browse mountains of articles specifically for educational resources.
What would be really nice is a complete list by subject of the educational resources in mathematics that people have made available online as a source;
and that is what I would like this question to become.
So: if you have (or know) course notes, textbooks or similar, which are available online in source form, via Arxiv, or elsewhere, post it as an answer, and I will keep the question updated with a categorized list.
(Note: no special processing is required to make the LaTeX screen reader user-friendly.)
Thank you in advance for making life easier for blind students in math.
P.S. I hope this is a suitable place to do this post; sorry in advance if this is not the case.