“Open the Fonts dialog (Windows->Dockable Dialogs->Fonts)
Right click any font in the list
Choose ‘Render Font Map’
In the dialog that appears, leaving the ‘Filter (regexp)’ blank will list all your installed Fonts.”
Source: http://gimpforums.com/thread-font-examples This forum thread clearly lists the steps for rendering a sample of each font in your GIMP library. I hope that this helps someone who stumbles on this question like I did!