BitNami WordPress installer is a free, self-contained native installer for WordPress that includes Apache, MySQL and PHP. It can be deployed using a native installer, as a virtual machine, in the cloud or as a module over an already installed infrastructure Stack.
BitNami native installers automate the setup of a BitNami application stack on Windows, Linux or Mac OS X. Each installer includes all of the software necessary to run out of the box (the stack).
A BitNami Native Stack Installer includes everything you need to run your BitNami-packaged application of choice. Once downloaded, you can launch it and it will provide a step-by-step wizard.
More info: http://bitnami.org/stack/wordpress
BitNami also provide WAMPStack for PHP applications.