Looks like it is using the electron framework http://electron.atom.io/ http://electron.atom.io/ To be sure, JavaScript can sometimes be fairly terrible as the

Looks like it is using the electron framework http://electron.atom.io/ http://electron.atom.io/ To be sure, JavaScript can sometimes be fairly terrible as the scope of projects grow. The advantage here is how easily rich (or even absurd) UI elements can be implemented across all platforms by using web technologies. It also makes it comparatively easy to create a platform that is highly customizable and pluggable.