ESBCalc is a Freeware Windows Scientific Calculator with Infix Notation, Brackets, Scientific Functions, Memory, Optional Paper Trail, Result History List, Customisation of the Colours and Fonts used, Customisation of the Hints, and more. Functions include Trigonometric, Hyperbolic, Logarithmic - Base 10, Base 2 and Natural - and many more. Includes Prefix Function support so that Log (1.3) can be entered as log 1.3 rather than as 1.3 log which is also available if you prefer that behaviour. The current state of Precedence, Prefix Functions, etc can be displayed at startup to help avoid confusion.
Looks best with Windows XP / Vista / 7 in 800x600 (or better) and 32-bit colour.
Portable Version also available.