title: Is there a dependency management tool/library for JavaScript?
body: <p>Is there a dependency management tool/library for JavaScript?</p>
  
  <p>PHP has <a href="http://getcomposer.org/" rel="nofollow">Composer</a> and <a href="http://packagist.org/" rel="nofollow">Packagist</a>.</p>
  
  <p>Ruby on Rails has <a href="http://gembundler.com/" rel="nofollow">Bundler</a>.</p>
  
  <p>What is available for JavaScript? </p>