Downloading IconDropper 3.2 for Mac from the developer's website was possible when we last checked. We cannot confirm if there is a free download of this app available.
According to the results of the Google Safe Browsing check, the developer's site is safe. Despite this, we recommend checking the downloaded files with any free antivirus software. The actual developer of this Mac application is The Iconfactory. IconDropper for Mac lies within Theming Tools, more precisely Icons & cursors.
From the developer:
IconDropper is a software program that allows you to customize your Mac's icons on-the-fly through the use of Drag-n-Drop technology. Instead of having to copy and paste custom icons from many different locations on your hard drive, IconDropper stores all icons in custom designed sets called "packs". A single click is required to update any folder's icon and see the results in real time.
You may want to check out more Mac applications, such as agua or Can You Jump It 3D, which might be similar to IconDropper.