GUI -what is possible?

What can we do with GUI?
As I understand, with standard PyPRP plugin it is impossible to make GUI interface in age.
But I heard that some non standard exporters (branches from PyPRP as I understand) are capable of it.
If so, can someone point me to info about it?
I'm also interest:
is it possible to make GUI "plugins" to KI device? Example of what I'm talking about is visible in Jalak, where You have additional GUI accessible though KI.
I use to though that it's direct part of client exe, but I think that I saw this GUI also in converted to POTS version of Jalak, hence this question.
As I understand, with standard PyPRP plugin it is impossible to make GUI interface in age.
But I heard that some non standard exporters (branches from PyPRP as I understand) are capable of it.
If so, can someone point me to info about it?
I'm also interest:
is it possible to make GUI "plugins" to KI device? Example of what I'm talking about is visible in Jalak, where You have additional GUI accessible though KI.
I use to though that it's direct part of client exe, but I think that I saw this GUI also in converted to POTS version of Jalak, hence this question.