calculate

Art Directors Toolkit (ADT) is the “Designer's On-screen Toolset” for Artists and Designers working with digital media.

HashMyFiles is small portable utility that allows you to calculate the MD5 and SHA1 hashes of one or more files in your system.

SMath Studio is a math program with 'paper'-like interface and numerous computing features. It has an ability to work with systems, matrices, vectors, complex numbers, infinities and fractions. SMath Studio includes integrated mathematical reference book.