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Perl OSSP uuid module.
V8 is Google's open source JavaScript engine. V8 is written in C++ and is used in Google Chrome, the open source browser from Google. V8 implements ECMAScript as specified in ECMA-262, 3rd edition.
Vagrant is a tool for building and distributing virtualized development environments.
Valgrind is a tool to help you find memory-management problems in your programs. When a program is run under Valgrind's supervision, all reads and writes of memory are checked, and calls to malloc/new/free/delete are intercepted. As a result, Valgrind can detect a lot of problems that are otherwise very hard to find/diagnose.
Valgrind is an instrumentation framework for building dynamic analysis tools. There are Valgrind tools that can automatically detect many memory management and threading bugs, and profile your programs in detail. You can also use Valgrind to build new tools. The Valgrind distribution currently includes six production-quality tools: a memory error detector (memcheck, the default tool), two thread error detectors (helgrind and drd), a cache and branch-prediction profiler (cachegrind), a call-graph generating cache and branch-prediction profiler (callgrind), and a heap profiler (massif).