Take a look at Mathics [1]. It's a FOSS Mathematica clone with browser-based notebooks. You can try it free online [2] [1] http://mathics.org/ http://mathics.o

Take a look at Mathics [1]. It's a FOSS Mathematica clone with browser-based notebooks. You can try it free online [2] [1] http://mathics.org/ http://mathics.org/ [2] http://www.mathics.net/ http://www.mathics.net/ Disclaimer, I'm the Mathics vice developer.