You could have downloaded nfsYearSnake 4.4.4.380 for Mac from our software library for free. This free Mac application is an intellectual property of newfreescreensavers. The software lies within Theming Tools, more precisely Screensavers.
From the developer:
New Year Screensavers will add a holiday atmosphere to your place and brighten up New Year Eve. nfsYearSnake is a free New Year screensavers that will decorate a computer monitor with a Snake, a symbol of 2013 year.
Within the installation, ads will be shown offering other interesting programs. You can add them or decline.
You may want to check out more Mac applications, such as scarytime v9, Christmas Tree Creator '04 or DesktopEarth 3D, which might be related to nfsYearSnake.