Porticus is described as '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. Porticus provides a GUI front-end to this tool'. There are three alternatives to Porticus for Mac, Xfce, Debian and Linux. The best alternative is Synaptic, which is both free and Open Source. Other great apps like Porticus are Pallet (Free, Open Source) and PortAuthority (Paid).
Synaptic is a graphical package management program for apt. It provides the same features as the apt-get command line utility with a GUI front-end based on Gtk+. * Install, remove, upgrade and downgrade single and multiple packages. * Upgrade your whole system.
PortAuthority provides a GUI for the MacPorts Unix software management system for Mac OS X. MacPorts is a powerful command-line tool for installing and updating a variety of Unix-based applications for the Mac.