Hello! Web developer here who has a personal, vested interest in a more accessible web, and developing tools to do so. I actually posted a while back with a braille file to text file conversion tool (which is unfortunately down at the moment, while I work to modify it for better security on the server).
I've recently started branching out to Chrome extensions for adding accessibility to elements of webpages that do not currently have them. My hope and dream is that eventually these sites fix the issues themselves and my work is not needed. I do contact every site I build something for, and let them know what needs to be done from a technical standpoint.
I develop these for someone near and dear to me, so the process usually goes "Doing x on this site is terrible / not doable since I can't find / click / toggle this, can you do anything about it?" At that point, I look at the site, and if possible, use JavaScript to make those more accessible. I'd originally built these as TamperMonkey scripts, but TamperMonkey itself is not accessible, and thus Chrome Extensions.
I have two (well, 3 but the third still needs some work) currently published, both for AllMusic.com. I'm sure they could still use a little clean-up, but the goal was first to make these usable, and then later go back and improve.
**Note: You will likely want uBlock Origin or a similar Chrome extension running to visit allmusic.com since there are a fair number of annoying ads otherwise**
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$1: Album ratings are used to provide further suggestions for music you might like, so this is a pretty critical part of the site. This unfortunately has to use a prompt box, so it's not the prettiest interface, but neither is the native one (clicking halfway across a star icon)
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$1: Lets you follow or unfollow an artist for updates, adds a label to the button and aria-toggle (pressed is following, unpressed is not)
I plan to develop more of these as specific instances are found where they might help. If any of you have a specific element on a particular site that you'd like me to take a look at, I'd love to hear it!