Is this Open-sourced? looking at the website it doesn't seem like it

No the code we write is mostly closed-source, but it is based on this open-source project: https://github.com/google/flutter-desktop-embedding

So how are you going to monetize this?

do you plan on open sourcing? what are your plans?

No, it's a commercial product. At some point we will charge a fee to publish apps on our platform.

I know!

How is that going btw?

Pretty good! We're planning to have our first public release next week (for Mac, not Windows yet). You can register to be notified of new releases here: https://feather-apps.com/#cta-5