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It’s live in the Mac App Store!  Check it out:  Console Calculator for OS X

Console Calculator is a powerful calculator with a simple console interface. In addition to being a high-precision calculator (300+ bits of precision), it also supports base conversion, units conversion, and much more. The interface is convenient and easy to use. Create your own variables and functions, recall previous entries, and quickly hide it with a keystroke. Many other conveniences are included that make Console Calculator a multi-function tool that engineers or software developers will appreciate.