丹尼部落

小巧的數學運算軟體，指令或排版不像Mathematica之類的專業軟體人性化，功能也遠遠不及巨型運算軟體，但他的優點是體積小，可使用免安裝版本。

官方網站：http://www.speqmath.com/index.php?id=1
官方介紹：
SpeQ is a small, extensive mathematics program with a simple, intuitive interface. All calculations are entered in a sheet. In there you can freely add, edit and execute all calculations. You can define variables and functions, and plot graphs of your functions. You can save your calculations for later re-use.

SpeQ is written to be an advanced but very easy to use math program. It is small and fast and runs on every Windows computer, also from an USB-key or floppy disk. SpeQ is useful for simple, brief calculations as well as working out sheets with extensive variable definitions, functions and complex calculations.

SpeQ is usable for engineers, students and pupils or simply as replacement of the Windows Calculator. 

SpeQ has the following features

Expression calculations with arithmetic, conditional, logical and bitwise operators
Around 100 built-in mathematical, physical and conditional constants
Around 60 built-in functions for Analysis, Arithmetic, Complex numbers, Hyperbolic, Integers, Logical, Probability, Numeral systems, Statistics, Trigonometry
Define your own variables and functions for use in calculations
Plot fully adaptable graphs, trace the plotted functions, save your graphs
Extensive support for units
Decimal, binary, hexadecimal and octal numeral systems
Calculations with lists
Complex number calculations
Colored workarea
Save and load sheets
Orderly overview of all available functions and constants in the Functionstree
A list with all defined variables and functions in the Memorylist
Context-sensitive help and a detailed users guide 

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官方安裝版
官方免安裝版

算術過程中還在回憶似曾學過的單位換算嗎？
還是還在找你的工程計算機？
才又發現連工程計算機都沒有？
甚至想去知識+爬文或發問了？
先試試這款軟體吧！


介紹：
Unit Converter Expert is a standalone utility (no install needed) that can convert values between more than 2100 units of measure in more than 70 categories, including fluids, light, magnetism, engineering, radiology, weights, distance and many others. 

本文引自：http://www.calcexpert.com/unitconverter.htm

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