brew install rwhogg/personal-thirdparty/<formula>
Or brew tap rwhogg/personal-thirdparty
and then brew install <formula>
.
Or install via URL (which will not receive updates):
brew install https://raw.githubusercontent.com/rwhogg/homebrew-personal-thirdparty/master/Formula/<formula>.rb
brew help
, man brew
or check Homebrew's documentation.