homebrew - GitHub - new package manager for Unix software on OS X. A few interesting approaches, unlike Fink and MacPorts (I usually prefer the latter) it builds on already installed tools and libraries and therefore does not install half the internet if you only need a small tool. However, it currently has almost no support for dependencies, and the selection of packages is still quite narrow. And the result is really just self-compiled tools with a bit of link management around them.