Lightning Brain LikeFindsLike for InDesign for Mac

From Rorohiko:

This tool helps you quickly select a bunch of similar items that are scattered all over a page or a spread. Instead of having to shift-click-click-click to select a number of scattered frames of the same type, you can now select a single frame, and then use the 'Select All Similar' function to select all the other similar frames in one go. A typical example usage is to manage pages that have multiple copies of a few intermingled frame types - for example, there are image frames for some pictures, and each of those image frames is accompanied by a caption frame right underneath.