Second Life is a free online virtual 3D world imagined and created by its Residents. From the moment you enter Second Life, you’ll discover a fast-growing digital world filled with people, entertainment, experiences and opportunity. To get started, you will need to download the Second Life viewer or installer. Once installed, you will be able to walk, ‘teleport’ or even fly to thousands of exciting 3D locations. You can also use voice and text chat to communicate with other real people from around the world. Supports Mac OS X 10.4.11 or better. Versions are also available for Windows and Linux from this site.