Acqualia has updated Soulver (http://www.acqualia.com/soulver/), a calculator that provides a word processor style interface for doing math on your Mac, to version 2.0. The upgrade brings units, conversions, stocks, answer tokens, syntax coloring and other new features.
Soulver lets you do calculations over multiple lines like you would on paper, and you can use words alongside your numbers. It’s designed for day-to-day sums and calculations, to do complex mathematics in different bases. As such, Soulver includes all the standard mathematical functions, supports very large numbers, and has support for hex and binary calculations. When you’re finished, you can save and print out your work.
Soulver costs US$24.95. Existing Soulver owners can upgrade to 2.0 for $12.95. Anyone who purchased Soulver 1 in 2010 receives a free upgrade. Soulver is also available for the iPad and the iPhone.