My GTemplate is simple but feature rich GUI Application template written in C using GTK3/GTK4. Several features are included along with a script to bootstrap your own project.

The project is released into public domain (CC0). Feel free to use it the way you wish. If you wish to support me, consider donating me via librepay.

If you wish to learn GTK+, see the GNOME Platform Demos and Getting started with GTK3.

Figure 1: Obligatory screenshot

Figure 2: The same on Windows 8

Source: GitLab GitHub