SpeQ is a lightweight, extensive mathematics program with a simple interface. All calculations are entered in a sheet, where you can add, edit and execute all calculations. You can define variables and functions, as well as plot graphs of your functions.
Calculations can be saved for later use.
Category:  
System Requirements:  Win95 / Win98 / WinME / WinNT / Win2K / WinXP / Vista / Win7 
Writes settings to:  Application folder 
License:  Freeware 
How to extract: 

What's new? 
SpeQ Mathematics 3.4 (Released 20100407) (new) Function Run(filename) added, which evaluates the contents of a speq file. This way you can easily include a file with your own commonly used variables, functions, and units into all of your worksheets. (new) Function AddUnit(name {, relation}{,prefixtype}). You can now add your own custom units too. (new) Operator In for units, "x In unit". This operator is the same as function Convert(x, unit). The operator In supports lists, and the function Convert not. Example usage: "5.1 Inch In Meter", "10 °C In °F", etc. (new) Function fnSolve(f(x) {, x} {, xstart}), to find zero points of a function. (new) Binary SI units for calculations with bits and bytes. (new) Units fully support exponent suffixes now, fore example "mm2" is interpreted as square millimeter, and "m3" as cubic meter. (new) Added units: Angstrom, mil, sqmil. (changed) Implicit multiplications with units now have lower precedence than explicit multiplication and division. So for example "12V/6A" is now calculated as "(12*V)/(6*A) = 2 Ohm" instead of "((12*V)/6)*A = 2 W". (changed) Function factorial (x!) is now much faster for decimal values. (changed) Some changes in the arrangement of functions and units in the Functions window. (changed) The accuracy optimizer is improved. For example Cos(90 deg) now gives 0 instead of 7.273641325e16. (changed) Adding and subtracting temperatures is now only allowed with the same temperature scale (for example 20 Celsius + 5 Celsius) or in Kelvin (for example 20 Celsius + 5 Kelvin), to prevent conversion issues. (changed) SpeQ uses a different degree (°) character now, which is supported by more different fonts and by the web. This character is not backwards compatible. (fixed) Bug with calculating Atan2 and Arg when Angles was set to Degrees or Gradians. (fixed) SpeQ crashed when you opened more than 9 functions in one graph. (fixed) Some problems with nonWestern fonts. (fixed) Units: small rounding error in the unit foot and mile. (fixed) Units Litre and L now support prefixes. (fixed) Problem loading files with a dot in the name. (fixed) SpeQ checks now at startup whether the stored window position fits in the current screen dimensions. If not, the position is adjusted. (fixed) Various stability issues, and other small improvements. 
wanted to give it a try, but removed it 20secs after installation: makes the usual mistakes in setting colors and thus is unreadable on dark desktop colorschemes, and there is no way to manually set the colors.
This is a true gem in my collection. I don't quite like recent versions (feature creep), but I still use it for 95% of my day to day calculations/graphing.
For everything else there is Python + matplotlib.
WOW, extremely pleased with the graphing capabilities. This program has potential to replace matlab if sripting and array support is included in future versions.
Tip: you can reduce the size of the program to 132 KB if you remove the usersguide. SpeQ will open the online usersguide instead.
Amasing what you can do with only 300KB.
professional & feature rich  I use it instead of MATLAB for all simple, day2day calculation.
Highly recommended !
SpeQ is just great! I need formula graph bitmaps for websites from time to time and this is exactly the utility I ever wanted to create them easily. GIF / PNG export would be a nice enhancement (but converting the bitmaps with another tool afterwards is no problem).
simply Great . I like the codelike interface in which it works.
v3.4