This software is a GTK and Xfwm4 theme that provides a visual interface and control over the appearance of an operating system's windows and graphical user interface.
In total, the theme comes in eight different color variations, so you can choose the one that best suits your preferences. The color options include: Black, Red, Ice, Gray, Striped-Blue, Striped-Gray, Striped-Yellow, and Orange.
Moving onto the topic of GNOME, this software is an international project that aims to build a complete desktop environment exclusively using free software. This includes creating frameworks for software development, selecting application software for the desktop, and working on the programs used for tasks such as application launching, file handling, and window and task management.
GNOME is part of the GNU Project and can be used with a variety of Unix-like operating systems, with Linux being one of the most notable. It can also be used as part of the Java Desktop System in Solaris. Although the original acronym for GNOME was GNU Network Object Model Environment, this is now considered deprecated.
Above all else, the GNOME project places a great emphasis on simplicity, usability, and ensuring that everything just works perfectly.