CMS
Get flash to fully experience Pearltrees
Themes
Zen Zen is a powerful, yet simple, HTML5 starting theme with a responsive, mobile-first grid design. If you are building your own standards-compliant theme, you will find it much easier to start with Zen than to start with Garland or Stark.
Modules
Views You need Views if You like the default front page view, but you find you want to sort it differently. You like the default taxonomy/term view, but you find you want to sort it differently; for example, alphabetically. You use /tracker, but you want to restrict it to posts of a certain type.