Just to prove that I can write software with a GUI, here is one !
When I was with Adam Internet for my Internet provider for 3 years, I wrote this program in Qt 4.3. It connected to Adam Internet's user stats page, parsed some usage info, and then graphed this usage data over time so that I could graphically monitor my usage.
This was private work and never released. It's obsolete now as I've been with internode since 2013.