This software is a GNOME desktop theme with a dark and flat design, perfect for those who prefer a sleek and minimalist interface.
In addition to providing users with themes, Pixel OldSchool is also built on top of GNOME - an international effort to build a complete desktop environment using entirely free software. This goal encompasses activities such as creating software development frameworks, selecting application software for the desktop, and designing programs that manage application launching, file handling, and window and task management.
GNOME is part of the GNU Project and can be used with various Unix-like operating systems, including Linux and as part of Java Desktop System in Solaris. The name itself originally stood for GNU Network Object Model Environment, albeit this acronym has now been deprecated. The GNOME project places a heavy emphasis on simplicity, usability, and making things "just work". If you're looking for a desktop environment built on free software that is easy to use, Pixel OldSchool may just be what you're looking for.