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ack is a good improvement on grep. When I discovered it, I decided to write a similar tool in Cocoa, exclusively for Mac OS X and with (optional) UI. VisualAck is a result of that decision (and a testimony to my unimaginative naming skills).
It’s a first public public release with a rather arbitrary version number. The only important part about the version number is that it’s not 1.0, which means that this program is a work in progress.