Preview Photoshop Brushes Easily: ABRView
For any designer with significant amount of Photoshop brushes installed, it is always a pain to navigate through the brushes & find the one you need.
ABRView is a free software that makes this process much easier. It allows you to define the folder(s) where brushes are installed & preview them.
Also, once you download a brush, although you have an opinion on how it looks, you can not be sure until installing it, running Photoshop & checking the look from the brush palette. As ABRView can display brushes from any folder, you simply save time on seeing how they look.
It has an .exe version for Windows & .jar version for Mac & Linux.