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.
What's new in this version:
Version 3.4 fixed a bug which plotted Plot(Sin(x),x) as two functions, Sin(x) and x.