Gruff 5.3.1 for Mac could be downloaded from the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free Mac application is a product of Franz Inc. The software is included in Developer Tools.
This app's bundle is identified as com.franzinc.Gruff64-AG3.3. Some of the application aliases include "Gruff64-AG". We recommend checking the downloaded files with any free antivirus. The following version: 5.3 is the most frequently downloaded one by the program users.
From the developer:
Gruff is a graphical triple-store browser that attempts to make data retrieval more pleasant with a variety of tools for laying out cyclical graphs, displaying tables of properties, managing queries, and building queries as visual diagrams. You can use Gruff to display visual graphs of subsets of a store's resources and their links.
You may want to check out more software for Mac, such as Wandering Willows or Time Dreamer: Temporal Betrayal, which might be related to Gruff.