Mac OS X - Package Management with MacPorts

MacPorts
The MacPorts Project is an open-source community initiative to design an easy-to-use system for compiling, installing, and upgrading either command-line, X11 or Aqua based open-source software on the Mac OS X operating system.

You can obtain MacPorts from the download page as a package (For Lion, Snow Leopard and Leopard - At time of writing) or you can build from source.
This will typically be installed into /opt/local/bin, so make sure this sits in your PATH.

Update MacPorts

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1. port selfupdate

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View installed ports

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1. port installed

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Search for ports

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1. port search apache2

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Get information about a port

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1. port info apache2

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Find out dependencies for a port

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1. port deps apache2

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See what variations for a port are available (I.e. with/without SSL)

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1. port variants apache2

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Install a port (-f = Force activation)

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1. sudo port install -f apache2

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Clean an installed port

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1. sudo port clean --all apache2

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Uninstall a port

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1. sudo port uninstall apache2

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Display files belonging to an installed port

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1. port contents apache2

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Upgrade a port

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1. sudo port upgrade apache2

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More information can be found on the official MacPorts Guide.