Sage

Sage is an open source collection of mathematical software with a common Python interface. The lead developer is William Stein, a number theorist in the Mathematics Department at the University of Washington.

The Sage notebook was an original model for the IPython_notebook.

You can try Sage online by typing into a cell at https://sagecell.sagemath.org/. You can type straight Python as well as using the enhanced capabilities of Sage.

See:

• http://interact.sagemath.org/top-rated-posts
• http://trac.sagemath.org/sage_trac/

for some online sage examples.