Does Asterisk-GUI (http://svn.digium.com/svn/asterisk-gui/trunk) still work with Asterisk? Is the development of Asterisk-GUI going to continue in the future?
Probably not, and no.
And to provide some date information, it hasn’t really been touched in almost 13 years.
I have created my own Asterisk GUI development using the Realtime Asterisk Database and PHP.