Re:Taming math and physics using SymPy [pdf]
by lutusp on Friday August 29, 2014 @04:45PM
(#8244427)
Complete agreement -- IPython is a nice, relatively lightweight mathematical environment based on Python. Runs locally in a browser [EDIT: and command line as well]. Easy to use. Free.
My IPython tutorial: http://www.arachnoid.com/IPython