Second Life (abbreviated as SL) is an Internet-based 3D virtual world launched June 23, 2003 and developed by Linden Research, Inc, which came to international attention via mainstream news media in late 2006 and early 2007. It provides a platform for human interaction with a high degree of naturalness.
Linden Lab provides open source official viewers for. The viewers can be used as a basis for various modified viewers.
Study the structure of Second Life, research its abilities and create your own viewer.