From about 2000 util about 2010 I was a die-hard ActionScript developer. I used to work for a number of digital advertising studios building gigantic full browser Flash monstrosities for our clients. Never really dabbled in Flex but it was on my periphery. I do remember that it was part of the RIA [1] push of the mid-2000's. Interesting times.

[1] https://en.wikipedia.org/wiki/Rich_Internet_Application

I was just today looking to see who owns Flex and Air. There is Apache Flex but it does not look like it is widely used. And it looks like Air was sold to Harman an audio electronics subsidiary of Samsung.

It would be cool if there was a browser that had a full set of components that would allow fast construction of internal dashboards, CRUD apps, etc. via new html tags. if not that then maybe a custom browser with flex enabled for internal use only. The security and performance would have to be improved but seems like a really fast way to prototype and build internal only sites.

There was a good two years or so where I was working in Flex for desktop app publishing. It was okay.