AquaLess

AquaLess screenshots

It lets you browse plain text files and text output from Unix command line tools
AquaLess 1.6 : Program window

Alternative downloads

MacMP3Gain
2.1.1
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AppleScript Studio application which brings an Aqua GUI to the command line version of mp3gain...
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Shellac
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UNIX power tools conveniently packaged as Automator actions.