You could have downloaded Xprop 1.0.1 for Mac from our software library for free. The actual developer of this free Mac application is Vadim Shpakovski. Xprop for Mac lies within Developer Tools, more precisely Webmaster Tools.
From the developer:
Xprop is a free and open-source plugin for Xcode 4 that will exclude @property and @synthesize document items from the navigator menu. To activate Xprop, you just need to click on the View > Standard Editor > Hide Properties from Document Items options after installing the plug-in.
You may want to check out more software for Mac, such as AcidSearch Installer, Browsealoud or RAGE WebDesign, which might be similar to Xprop.