+ Rightware Kanzi (https://www.rightware.com/kanzi)
+ DiSTI GL Studio (https://www.disti.com/user-interface/gl-studio/)
+ Altia (https://www.altia.com/)
Most of them have found niche markets in verticals like automotive/medical/embedded, where it's easier to just ship a runtime for the UI.
UI/UX designers working on the dominant platforms (web/mobile) have a lot of nostalgia for Flash--particularly the perceived ability to actually ship functioning product. There's no lack of new tools trying to improve on the status quo: drawing pictures of UI and throwing them over the wall for developers to figure out how to implement.
I suspect that we haven't seen the aforementioned IDEs become industry standard for a couple reasons:
+ They're by nature more difficult to use than drawing tools, often surfacing a lot of advanced parameters, state machines, and code
+ The variability in languages/frameworks/platforms inherent in web and native development make usable output a much harder problem than having everyone all-in on a single framework/runtime