libc++ is one of sub-projects of LLVM.
The libc++ project provides
a standard conformant and high-performance implementation of the C++
Standard Library, with an aim of supporting C++'0x when the standard is
ratified.
The LLVM Project is a collection of modular and reusable compiler and
toolchain technologies. Despite its name, LLVM has little to do with
traditional virtual machines, though it does provide helpful libraries that
can be used to build them.
From its humble beginnings as a research project at
the University of Illinois, LLVM has
grown to be an umbrella project consisting of a number of different
subprojects, many of which are being used in production by a wide variety of
commercial and open source projects
as well as being widely used in academic research. Code
in the LLVM project is licensed under the "UIUC" BSD-Style license.
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