High Quality Content by WIKIPEDIA articles! The Tango Desktop Project is an open-source initiative to create a set of design guidelines and to provide a consistent user experience for applications on desktop environments. The project has created a set of icons known as the Tango Icon Library, which is described as a "proof of concept". The Tango Desktop Project is a project of freedesktop.org, and is closely linked with other freedesktop.org guidelines such as the Standard Icon Theming Specification.