Little Hex Viewer
This is an incredibly simple hex viewer, that runs in your browser. You can see a simple demo of this running over at Glitch.
Just install and run!
npm install npm start
You can now open a new instance of the hex editor by opening the URL printed after you started node.
On the homepage, you can choose a file to look at. Warning: The viewer doesn't split large files, meaning you shouldn't try to view incredibly large ones.
Open an issue!
I hope you find this tool helpful!