There are several add-ons and extensions that offer accessibility options
Our goal is to design our content to minimize the need for those tools.
Allows you to simulate several different disabilities within the Chrome Browser. Great to use if testing the accessibility compliance of your web resources.
Screen recording extension that will let you capture video & audio from your computer for free up to 5 minutes in length. If you need longer, you can upgrade to their paid version.
Very simple audio recorder, as the name implies. Click the icon to start recording, click it again to stop and it immediately downloads the audio file to your machine. If you are on your Chromebook it will be available in the downloads folder to transfer to drive. Simplest way to capture audio if you want to add audio to your Slides presentations.
Allows you to split your Chrome tabs into multiple layouts depending on your needs and preferences. Would be great to use with students that are easily distracted moving between tabs on the browser.
Grackle Docs-Accessibility checker for Docs. Scans the document for 22 different features and gives recommendations to improve accessibility. The free features allow you to scan your documents. The paid features also allow you to jump straight to each section and make your corrections. The paid version is quite pricey, but can cover an entire domain.
If you use these add-ons with students it will eliminate some of the distractions that may cause issues for students. These allow the student to stay within the current app instead of opening a new tab or app.
Easybib: Allows students to generate a bibliography/citation list without leaving the document. It also switches between multiple styles.
Docutube: More information on this add-on can be found at the Docutube developers website There was a recent update to the add-on causing a problem with the Google Sign-on process for it. Hopefully the developer is able to take care of this issue. This is also an add-on that can be pushed out across the entire domain.
Grackle Slides-Same as the Docs version but designed for Slides
Slides Toolbox: This has many great tools to assist you while you create slideshows, but the one I like the most is the ability to create a table of contents with hyperlinks. This eliminates the need to create one manually and gives you some of the same functions found in Docs.
SlideContents: If you don't need any of the other tools found in the Slides Toolbox, try SlideContents instead.
Slide Object Order: Allows you to control the tab order of objects in your slide. Very useful for screen reader setup. Much easier than moving the object forward and backward on the slide layout.
Most of the other add-ons for Sheets are productivity related and don't do much to help you assess or improve accessibility.
There are many addons available for forms, but I have not found any that are worth mentioning in regards to accessibility.