Calca was a tool for Windows/Mac where you could type formulas with markdown text interspersed, like:
# My work
a=7
b=2+a^2
b=> 51
Where it would dynamically show you the results after => and recalculate everything when you change anything. I think it's been abandoned some years ago.
Is there anything like that available as an online tool? Seems like a nice mashup of a spreadsheet (because it recalculates as you go), a text editor with Markup, and a symbolic math package (though Calca didn't have much symbolic math, just basic equation solving). It would be great to have something simple like this.
