Do any of you know of a good lightweight cross platform GUI system that doesn't use C++, .NET or Node.js? I'm kinda tired of those three.
Bonus points if it's easy to learn.
Should be stand alone on the desktop.

Qt has Python bindings, I used it a while ago and was quit happy with it.

@leuu qt is currently giving me a headache

JavaFX? Useful especially if you've done some android development

Edit: Sorry I missed the lightweight part.

@tahnik I've done stuff in it in the past, while trying to retrofit it to work with scala.
But yeah, I want as few dependencies as possible. My client isn't exactly tech savvy

@ElectricCoffee JavaFX doesn't have any dependencies tho, other than the JRE. I don't think you'll need any other libraries.

@tahnik the jre is a dependency

@ElectricCoffee anything will have at least one dependencies if it's cross platform.

@tahnik I'm fine with recompiling it for each platform

@ElectricCoffee You can do native packaging with self contained JRE. In this way client won't need to install anything other than your app.

Python / Tkinter
Ruby / Shoes
Javascript / Electron

@tahnik interesting

@Madeindjs What's next with Ruby? Hats? Underwear? Pants?

@Madeindjs electron uses node

Even though it's JavaScript and NodeJS, just started with Electron and it's awesome!

@linuxxx I've had enough issues with npm to not want to use it anymore

GTK + pygtk ?

@rayanon is gtk usable on Windows Mac and Linux?

@ElectricCoffee AFAIK yes. Haven't used GTK apps in Windows and Mac

I think vlc uses gtk.

You have Go. UI wise I don't know, but there seem to be a few good candidates after a Google search

@viking8 go as in golang?

@ElectricCoffee yea. Just started with it myself, and much impressed

@stop Nope, QT.

Processing 3 is cool for quick prototyping.
It's Java so if you know Java you'll get the hang of it pretty quick.

http://processing.org

QML (for Qt) is kinda easy to learn because it's like html+css in a way. But Qt itself is one confusing son of a bitch if you don't have any experience with C++.

I heard only good thing about JavaFX but haven't tried it myself, but as @tahnik said, you can always include the JRE with some sort of installer builder tools.