PureBasic is very neat. I bought my license almost 20 years ago and I still use it to make small GUI utilities. It's a very nice IDE/editor and the famfamfam icons are always comfy.
It's still alive because it's a passion project for the developer, he doesn't make a lot of money from it. Not because the tool declined in quality, but because nowadays efficient RAD is a very niche market and the licenses are still valid for the lifetime (again showing the passion to the product rather than optimizing income).
See this interview for some details: https://www.purebasic.fr/blog/?p=554
If you think about it, Godot fits very well and is very, very cross-platform. It brings somewhat more but you can strip it down to only the necessary, throwing away the 3D stuff and keeping only what you use. It includes a scripting language and the GUI stuff. Someone could actually build a specific solution with it!
https://docs.godotengine.org/en/stable/engine_details/develo...
https://docs.godotengine.org/en/stable/tutorials/editor/usin...