Homebrew-versions
These formulae provide multiple versions of existing packages.
How do I install these formulae?
Just brew tap homebrew/versions and then brew install <formula>.
If the formula conflicts with one from mxcl/master or another tap, you can brew install homebrew/versions/<formula>.
You can also install via URL:
brew install https://raw.github.com/Homebrew/homebrew-versions/master/<formula>.rb
Docs
brew help, man brew, or the Homebrew wiki.