Homebrew is a free/open source software package management system that simplifies the installation of software on the Mac OS X operating system. Originally written by Max Howell, the package manager has gained popularity in the Ruby on Rails community and earned praise for its extensibility.
Homebrew has made extensive use of GitHub in order to expand the support of several packages through user contributions. In 2012, Homebrew had the largest number of new contributors on GitHub. In 2013, Homebrew had both the largest number of contributors and issues closed of any project on GitHub.