Greppie beats the competition hands down. It is the only interface to grep that does more than display the results of the search, which you can just as easily do in the Terminal application. Greppie takes care to analyze the results and present them in a meaningful and useful format. It saves your work so you can reduce the time it takes to perform repetitive tasks. No other grep interface on the Mac comes close. Greppie is a 100% native Cocoa application which means that it takes advantage of all that OS X has to offer.
What's new in Greppie
Added support for searching Mac text files
Italian localization by Gabriele Callari
Fixed some undo bugs
PowerSearch now uses graphic instead of text to be more clear