The libadwaita/gtk based gui installer using jade as the backend.
jade gui relies on a yet unreleased version of libadwaita, that's why you have to use flatpak to build it:
git clone https://github.com/crystal-linux/jade-gui
cd jade-gui
flatpak-builder --user --install --install-deps-from=flathub --force-clean build-dir al.getcryst.jadegui.yml
flatpak run al.getcryst.jadegui