The German public TV station ZDF points Mac users to DEVONagent for smart research on the web:
True research pros go even farther: They let search. Users automate their search runs using applications like “Copernic Agent” or “DevonAgent”. The search will take a few seconds longer but the results will be analyzed, an extract generated, sorted, and stored on the computer. This way researchers can work through the results quicker and more tightly focused.
If you read German, you can find the full article here.