assembled by home users or Corporate IT Departments. (See also White box (computer hardware).) There were many Nintendo Entertainment System hardware clones due to the popularity and longevity of the Nintendo Entertainment System. Hardware remakes Examples for hardware remakes are e.g. recent home computer remakes. A special kind of hardware remakes are emulators which implement the hardware functionality completely in software. For instance the WinUAE emulator software tries to behave exactly like a physical Amiga. Software Software can be cloned by reverse engineering or legal reimplementation from documentation or other sources, or by observing a program's appearance and behavior. The reasons for software cloning may include circumventing undesirable licensing fees, acquiring knowledge about the features of the system or creating an interoperable alternative for an unsupported platform. GNU, a clone of UNIX, was motivated by a need of the Free Software Movement for an operating system composed of entirely free software. In the United States, the case of Lotus v. Borland allows the functionality of a program to be cloned so long as copyright in the code and interface is not infringed. Yet the public interface may also be subject to copyright to the extent that it contains expression (such as the appearance of an icon). For example, in August 2012, Electronic Arts, via its Maxis division, put forth a lawsuit against Zynga, claiming that its Facebook game, The Ville was a direct clone of EA's own Facebook game, The Sims Social. The lawsuit challenges that The Ville not only copies the gameplay mechanics of The Sims Social, but also uses art and visual interface aspects that appear to be inspired by The Sims Social. The two companies settled out of court on undisclosed terms in February 2013. Examples of software cloning include the ReactOS project which tries to clone Microsoft Windows, and GNU Octave, which treats incompatibility with MathWorks MATLAB as a bug. Video games Since the start of the video game industry, clones of successful concepts and games have been common. The first influential first-person shooter, Doom, led in the 1990s to the creation of a new genre dubbed as Doom clones. In the 2000s the open world action-adventure Grand Theft Auto inspired the creation of many Grand Theft Auto clones. Software remakes Remakes of software are revivals of old, obsolete, or discontinued software (e.g. Abandonware). A good share of software remakes are Fangames of computer games and