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V8 is Google's open source high-performance JavaScript engine, written in C++ and used in Google Chrome, the open source browser from Google. It implements ECMAScript as specified in ECMA-262, and runs on Windows XP or later, Mac OS X 10.5+, and Linux systems that use IA-32, ARM or MIPS processors. V8 can run standalone, or can be embedded into any C++ application.
The LLVM Project is an open source collection of modular and reusable compiler and toolchain technologies.
LLV8 is an experimental top-tier compiler for V8. It leverages the power of LLVM MCJIT to produce highly optimized code. It is supposed to be used as a third tier for cases where it makes sense to spend more time compiling to achieve higher throughput.
LLV8 (backend) is implemented as a patch to V8 and it cannot function without the virtual machine. Although LLV8 is only a fraction of the entire patched VM, we also refer to the whole thing (our fork of V8) as LLV8.
Quick links: LLV8 design doc | Current state of the project.