[obdev]

Oracle still maintains JavaFX along with Gluon and others. New features and bug fixes are delivered on each release.

Java and JavaFX are being ported to iOS and Android as Project Mobile under the official OpenJDK umbrella.

JavaFX fresh builds are also seen on jdk.java.net now.

[pjmlp]

Yes, although that was quite recent, as Oracle was trying to breath new life into OpenFX, after it was taken outside of the JDK, keeping Swing the best option for those that don't want to deal with OpenFX distribution of native dependencies.

As far as I am aware, Project Mobile doesn't have much uptake, outside companies that are already working with Gluon.

[obdev]

Indeed, Johan Vos of Gluon is the leader of the Project Mobile.

Swing remains a decent GUI toolkit, but it still requires native dependencies for stuff like OS file dialogs and other platform APIs, audio/video codecs, hardware-accelerated graphics.

[pjmlp]

Swing ships with the JDK, so whatever native dependencies are required, application developers don't need to care about them, unless they are making use of jlink, and to this day many still prefer to push to some JRE being installed, than making use of jlink and jpackage.

Which is why alternative JDK distributions still offer JRE variants, while officially from Oracle's side one should either use plain JDK or jlink/jpackage.