Cacher is the code snippet organizer for pro developers

Asset store - all sorts of stuff to help you

Project view - Just a view of the folderstructure (don't rename or move files using the finder/explorer)
              - Use unity to modify content
              
Scene - contains instances of stuff in our project view (resources), or other specific stuff you create in the scene hierarchy
      - Can have multiple "levels" of a game in one scene
      
Scene view - See an overview of the current scene. Use to manipulate/move etc. to setup
            - Hand - pan around the scene
            - Translate - Move an object around in the scene
            - Rotate - rotate the object
            - Scale - change size (scale on axis or center)

Radial menu for unity ui
Script based runtime tree-view control
Side menu
NGUI: Next-Gen UI
DoozyUI: Complete UI management system