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. 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, 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 

Download : SpeQ Mathematics 3.4