PCalc is a high-powered scientific calculator that goes beyond the features found in the built-in Mac OS scientific calculator. Scientists, mathematicians, or just serious students will find quite a few bonus features comparable to those found in standalone programmable scientific calculators which PCalc’s interface mimics–including quick one-key conversions, constants organized by field (from astronomical to physicochemical), an optional RPN mode that matches modern calculators, and decimal, hexadecimal, octal, and binary modes. You can also write your own functions and conversions, maintain multiple calculators (all with different states), and use PCalc’s slightly lower-powered Dashboard widget for quick calculations. PCalc even comes with a virtual tape, so you can look through all your past calculations, and you can resize and skin your calculator with a variety of themes.

This shareware app is also available as a cheaper (and very similar) iPhone and iPad app, and the Mac version has been updated to add more of its features. If you regularly use a scientific calculator, you should definitely check out PCalc, on any platform.

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Like LaunchBar, Fruitmenu, and Default Folder, this popular and well-tested shareware GUI-enhancer has become an indispensable addition to OS X for many users. DragThing exists to make getting to things on your Mac–files, folders, apps, disks, URLs, and windows–quick and easy. Inveterate interface tweakers love DragThing because you can create multiple docks (like the OS X Dock) that can be almost infinitely configured to suit your specific situation. Plus, you can save snippets, define tons of hot keys, and perform quite a few neat OS tricks (like putting a Trash back on your desktop).

If you don’t like bells and whistles, DragThing might not be your thing–it’s arguably nothing but bells and whistles, and the preferences can be a little overwhelming to new users. But if you like to have your OS X experience just so, few apps can help you better. This latest update adds support for Snow Leopard, a new dock theme (“Marble”), an option to highlight 32-bit apps, and more.

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