Most of them have been tried for ages and never got anywhere, and still look like crap (e.g. tcl).
Others have crappy support for different platforms (e.g. GTK and Windows/OSX) and that's for decades, not just because they are new.
None of them has the promise of Flutter: modern JS-like language, dead easy development, simple IDE support, cross platform, nice UI toolkit, hot reloading, and so on.
Others have crappy support for different platforms (e.g. GTK and Windows/OSX) and that's for decades, not just because they are new.
None of them has the promise of Flutter: modern JS-like language, dead easy development, simple IDE support, cross platform, nice UI toolkit, hot reloading, and so on.