The combo C++ QML QtQuick made my life so much easier for a cross-platform OSX/Win app.
I was able to develop most of it on Linux, and it even looks nifty!
What else can you wish ? :)
I guess it's a fair trade-off when you target today's desktop systems. Otherwise, it might worth looking at Qt for Embedded Linux.
Qt is obviously very solid, definitely "production quality," while QML is solid in the sense of not buggy and the UI looks/feels/performs quite well on Windows/Mac (haven't tried on Linux). But QML can be slightly to considerably irritating to use because it's not always clear or intuitive how to accomplish something or why something isn't working the way I expect, and I usually don't find many examples/tutorials when I turn to Google. That said, it's far, far more enjoyable to build an app with QML than with HTML/CSS/JS; I'm way more productive and the result is an actual application rather than a weird facsimile.
SOOOO much nicer than HTML/JS/CSS trainwreck that is modern web development.
https://github.com/go-qml/qml
Even better with the Material additions from here:
https://github.com/papyros/qml-material
Building Google Material themed apps easily with a Golang back end? Lovely!
I really hope the Golang team are considering the QML package as part of the standard library in Go v2, it would an absolutely awesome GUI kit to have as standard!