Fyne
Cross platform GUI in Go inspired by Material Design
... with an API like Fyne that is designed for modern languages is easy and quick to learn. Add to this that the toolkit is open source, under the permissive 3 clause BSD license, and will always be freely available. You can be confident in a bright future of enjoyable app development. With a well crafted API, the clean looks of Material Design and clear documentation the Fyne toolkit is supporting a new generation of cross-platform app development.