It supports multiplatform app development with HTML/JS/CSS and the entire engine's runtime is just about 5MB which is unbelievably small!
I further analysed how this was possible, what I found was beyond fascinating.
1. The author has wrote a compiler that supports JS with useful extensions like classes and fancy stuff, even before ES6 came into existence.
2. He had built his own layouting engine that understands HTML and CSS 3.0
Basically he's built a custom browser engine, but custom tailored for writing multi-platform apps. So it's super-fast without as much memory taxes. It's not backed by a BigCo or a huge community (I guess) and I'm not sure whether I'll pick it for a business critical app. But the way it's architected seems far superior than the shortcut approaches that Electron or most other alternatives take.
The project is not even new. It's more than a decade old which itself is amazing.