Low Level Virtual Machine
It's being used to speed up Python, check http://code.google.com/p/unladen-swallow/ .
Check http://clang.llvm.org for information on the LLVM based C and C++ compiler.
An LLVM based debugger is available at http://llvm.org/viewvc/llvm-project/lldb/trunk/www/index.html?revision=105619 .
jdc 21-may-2010: To get started with LLVM, I made a Tcl wrapper for the LLVM C interface: llvmtcl.
APN LLVM wins ACM Programming Language Software award [L1 ]