Gimp has had CS5’s “Content Aware Fill” option for some time through a plugin named ‘Resynth’.  The two algorithms vary in their implementation and effectiveness, and UltraDownloads.com ran both of them through a series of tests to gauge the effectiveness.  Ranging from the fairly basic (above) to more complex tests, it’s interesting to see the unusual differences between the algorithms.

While neither tool emerges as the clear victor, each tool seems to excel in a certain area.  Read the translated version of the page for the full scoop.

Google Translate.