I'm a big MacPorts fanboy but since Homebrew is all the craze for a few years now, I tried to give it another look.

$ mkdir homebrew && homebrew
$ curl -L https://github.com/Homebrew/homebrew/tarball/master | \
         tar --strip 1 -xzvf -
$ sudo mv homebrew /opt/homebrew && sudo chown -R root:wheel /opt/homebrew
$ sudo brew update
Initialized empty Git repository in /opt/homebrew
[...]

OK, so far - so good. Let's search for some packages, shall we?

$ brew search foo
[...]

$ brew search bar
[...]

$ brew search ssh
autossh      git-ssh      libssh       mpssh        pssh         ssh-copy-id  sshrc        sshuttle     tmux-cssh    zssh
csshx        gssh         libssh2      mussh        rssh         sshguard     sshtrix      stormssh     vassh
homebrew/fuse/sshfs                 homebrew/php/php54-ssh2             homebrew/php/php56-ssh2             Caskroom/cask/ssh-tunnel-manager
homebrew/php/php53-ssh2             homebrew/php/php55-ssh2             Caskroom/cask/bassshapes            Caskroom/cask/sshfs
Error: GitHub API rate limit exceeded for 172.16.30.4 (But here's the good news: Authenticated requests get a higher rate limit. Check out the documentation for more details.)
Try again in 59 minutes 32 seconds, or create an personal access token:
  https://github.com/settings/tokens
and then set it as HOMEBREW_GITHUB_API_TOKEN

Wait, wat? brew is asking the remote repo if a package is available? I've just run brew update:

   update   - Fetch the newest version of Homebrew and all formulae 
              from GitHub using git(1).

But indeed, the search command will perform an online search:

   search  - [...] The search for text is extended online to some popular taps.

Fortunately one can set HOMEBREW_NO_GITHUB_API=1 to stop this madness.