Porticus is a Cocoa GUI for the MacPorts package manager. MacPorts provides ready to build open-source software packages modified to compile and run on Mac OS X. The MacPorts project provides a TCL command line tool to manage installation, update and activation of the port packages. Porticus provides a GUI front-end to this tool.
In fact Porticus does a little more than this by providing a GUI with standard Mac OS X application features such as a search box to find a specific port, contextual menus, tree and table views to select and view port information by category or name. In addition it provides integration with Growl for status reporting.