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Looks like a close copy of Soulver to me. I think in this case it's worth mentioning.

Ever since I first saw Soulver I have been eagerly awaiting a Windows alternative. Maybe with NaSC we're just a little closer.

There is OpalCalc for Windows: http://www.skytopia.com/software/opalcalc/

This was the first tool I thought of when I saw this. They actually look similar, too.

looks interesting, I wonder if it can be ported to Windows, where I have to spend my working life :-(. For something even more sophisticated and Mathcad-like take a look at SMath Studio: http://en.smath.info/, unfortunately only free as in beer.

I use something like speedcrunch. http://speedcrunch.blogspot.com.au/ Runs cross platform.

Also wanted more algebraic like wolfram alpha capability though.

Also, Numi http://numi.io/

There's also Calca which runs on Windows, Mac and iOS:

http://calca.io/