SVN

A version control system is essential to keep track of code changes, and provide a repeatable, reversible process for applying those changes to development, staging and production websites. At DTEK, we used Subversion (svn) for years, but recently made the change to Git. I won't get too deep into the reasons why, but the main win for us is the fast and simple branching; our workflow seems to be less "work" and more "flow" now that we're using git. ;-)