Second Life

Second Life (SL), created by Linden Lab, is an online, chat, build, VR (virtual reality), 3D environment that allows users to make objects, use custom textures and sounds, terraform land, and script object behaviors using Linden Scripting Language.

"The greatest thing-that-is-not-a-game of all time."

Official website: http://secondlife.com

Note: see newview for secondlife.exe client command-line options.

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SL | LSL | Lindens