CIDER is a Clojure Interactive Development Environment that Rocks for Emacs
Helm UI for Projectile
Magit is an interface to the version control system Git, implemented as an Emacs package.
Org mode is for keeping notes, maintaining TODO lists, planning projects, and authoring documents with a fast and effective plain-text system.
Django mode for emacs
Emacs powerline mode renders beautiful mode line.
Project Interaction Library for Emacs
Emacs advanced Kit focused on Evil: The best editor is neither Emacs nor Vim, it's Emacs *and* Vim!