Google Apps and Chromebooks, and the Chrome Web Browser, offer a tremendous amount of accessibility features to help vision and/or hearing impaired students.
Google Accessibility, Using Google Products, http://www.google.com/accessibility/products/, contains a wealth of information and resources, along with apps, that can help students, and teachers.
Chrome Toolbox http://www.chrometoolbox.com/ - This collaborative space was created to celebrate the many Apps and Extensions made by developers which serve the accessibility needs of individuals with disabilities.
Accessibility Options on Chromebooks http://www.chromestory.com/2013/02/accessibility-options-on-chromebooks/
Some of the main features:
Google updates Drive and Docs with improved screen reader, Braille display, and accessibility phone support
Speech to Text and Text to Speech
Read&Write for Google Docs - https://chrome.google.com/webstore/detail/readwrite-for-google/inoeonmfapjbbkmdafoankkfajkcphgd?hl=en-US
Introduction to Read & Write for Google http://www.youtube.com/watch?v=bPqbk7TJKLo&feature=youtu.be
Increased accessibility with Braille display support for Google Docs, Slides and Drawings
If you use a Braille display, you can now enable Braille support in Google Docs, Slides and Drawings to read and enter text. This option is currently available for Google Chrome and Internet Explorer.
http://googleappsupdates.blogspot.com/2014/06/increased-accessibility-with-braille.html
ELL Resources
5 Good Apps for ESL / ELL Students: http://www.freetech4teachers.com/2014/03/5-good-apps-for-esl-ell-students.html#.Ux75Qj9dWN0
Evernote - another great, free application - also has some accessibility features and extensions for Chrome.
Evernote for Education: http://educationaltechnologyguy.blogspot.com/p/evernote-for-education.html
Evernote Clearly - one click for distraction free online reading - Clearly is a browser extension that eliminates ads and other parts of a web page and just shows the article. This eliminates distractions, helping students read the article. It also has text-to-speech capabilities to read the web page to the user.