There are approximately 1787 add-in available in the app store to download.
The top one that saves users the most time (and it is FREE)
The COINS Auto-Section Box tool gives you tremendous speed and agility over managing three-dimensional views when analyzing model areas of particular interest. It allows you to quickly create temporary and permanent views to be used for immediate interrogation of the model or for construction document deliverables. This works by allowing you to focus on the model instead of managing views or a view’s properties.