The 1.1 version of Gridworks for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The bundle id for Gridworks for Mac is com.metaweb.gridworks.Gridworks. The most popular version of the application is 1.1. The application lies within Developer Tools, more precisely Webmaster Tools. This free Mac application was originally produced by Metaweb Technologies, Inc.
From the developer:
Freebase Gridworks is a power tool that allows you to load data, understand it, clean it up, reconcile it internally, and augment it with data coming from Freebase. All with the comfort and privacy of your own computer. Google Refine is a power tool for working with messy data, cleaning it up, transforming it from one format into another, extending it with web services
You may want to check out more Mac applications, such as Blog.Mac Template Editor, RAGE WebDesign or solr, which might be similar to Gridworks.