MacPorts is essentially a similar type of program to fink. However, it was created (I believe) specifically for the darwin operating system base, upon which Mac OS X is based.
One user (tkott) has gone through See [[Mac_OS_X_X11#Installing_gramps_for_X11_using_MacPorts|detailed instructions ]] on the installation process of installing Gramps through MacPorts and will be updating this section with his installation notes soon.