Easily install open source software with MacPorts
MacPorts, formerly DarwinPorts, is a free opensource app that allows Mac users to easily install command line software in Mac OS X. If this sounds to you like Fink, well, you’d be right because it’s pretty close. Functionality is much the same, but some people swear that MacPorts (or Fink) is better than the other. MacPorts is probably best for more advanced Mac users who have some experience with the command line, because MacPorts itself is also a command line tool.
After you install MacPorts, using it is pretty easy, you can search for, update, and install software with just a few commands.
Search for software with MacPorts (replace irssi with your package):
port search irssi
Install software with MacPorts (replace irssi with your package):
sudo port -v install irssi
Update all installed ports to most recent versions:
sudo port upgrade outdated
If you would prefer to use a GUI to install command line software, try out Fink Commander, which performs much the same as MacPorts but through a GUI interface. There are several GUI options available for MacPorts but most of them are shareware or commercial, and why pay for something that is free?