SpeQ

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 and colors
- Around 60 built-in functions for Analysis, Arithmetic, Complex, Hyperbolic, Integers, Probability, Statistics, Trigonometry
- Define your own variables and functions for use in calculations
- Plot fully adaptable graphs, trace the plotted functions, save your graphs
- 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