Low Level Virtual Machine http://llvm.org/ [http://llvm.org/img/LLVM-Logo-Derivative-2.png] 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]. <> Acronym