Workbox is a desktop environment (simulator?) in your web browser. Currently it can't do a lot and is mostly very alpha.
But it's build with web workers, so that's cool.
To locally install Workbox on your machine you have to clone the repo,
git clone git@github.com:TitanNanoDE/Workbox.git
install all dependencies,
npm i
and you might have to set up sub modules. Depending on the current state of the project, there will be different sub modules.
git submodule init
To build the project, make sure you have gulp-cli, then run it inside the project dir.
gulp
To run Workbox it has to be served by a web server. You can use Nginx, Apache2 or anything else.