TrackerGrep: Scan files for embedded text
As powerful and amazing as BeOS queries are, they don’t do one thing that Windows Find does: search through text files for embedded text. Of course, you can still do this from the command line with grep, but if you’d like a GUI interface onto grep, a must-have utility is the TrackerGrep add-on.
Once installed in your /boot/home/config/add-ons
folder, you can right-click any folder (or selection of files), enter a string, and hit enter. The add-on will build a list of files (in that folder and optionally also in its subdirectories) that contain that string. This is excellent for finding needles in the haystack of your old mail, for instance.