GUI's

C
C++
python

It needs to be a main stream language so a bigger base of people can maintain it.
For instance Mocca is pretty damn cool but if the originators stop maintaining it
how many people know pascal (I think it's pascal) well enough to update it?

Boy wouldn't a small manual dedicated to GUI developers be Handy.
probably see a few more GUI come along.

I would not focus that much on language.
From my point of view there are (at least) two other more important points:

- good documentation of the interface to EMC
- modular design with reusable elements

GUIs are often a matter of taste, and depending on the machine.
Which buttons are useful, which icons do you like, etc
But there are also common elements like 3D preview, g-code properties etc
Instead of starting the 17th GUI, maybe someone starts creating a toolchest, from which it could be more or less easy to design your own GUI.

regards, Gerd

A GUI for EMC2 is by its nature a graphical human machine interface.
For this reason, it must be considered both the programming language plus a graphical designtool.
Unfortunately axis is written without a graphical tool as pure python text (AFAIK).
Other EMC related programs like stepconf, pncconf are created using glade + python.
This seems to be a nice combination.
Of course the Qt-Designer is also nice, but why introduce new libraries and widgets.
So natural choices could be really glade+python or glade+C++

Gerd