MurrinaTarocco is a GNOME desktop theme with a dark design.
As for GNOME, it is an international effort aimed at building a complete desktop environment founded entirely on free software. This includes creating software development frameworks, selecting application software for the desktop, and working on the programs that manage application launching, file handling, and window and task management. GNOME is part of the GNU Project and is compatible with various Unix-like operating systems, especially Linux, and is used as part of the Java Desktop System in Solaris.
Initially standing for GNU Network Object Model Environment, the GNOME project puts a lot of weight on simplicity, usability, and ensuring that things "just work." Overall, MurrinaTarocco and GNOME are excellent software options that provide comprehensive desktop solutions.