If you're using a package manager on the Mac then chances are that you're using Homebrew ( Back in the day I was a proponent of MacPorts and Fink, but both of those projects have rather died on the vine - meanwhile Homebrew goes from strength to strength.

It's not perfect. One of the things that I don't enjoy about Homebrew is the mildly obfuscated method for finding packages. Enter Braumeister - an online browsable repository for Homebrew formulae. It's pretty great, actually. Now it's a snap to find and install a slew of freely available and well-supported tools as well as the things that make your computing experience mildly more enjoyable in oh-so-many ways. Which may or may not include ponies.