MathCAD worksheets
These are in MathCAD's (v. 15) .xmcd format. Right-click, choose Save as. You may need to remove a .xml extension that some browsers insist on adding.
MathCAD tutorial and examples (calculus, solve blocks, 2-d, 3-d plotting)
Electromagnetic units in MathCAD
Free-free (Bremstrahlung) emission notes
Synchrotron emission notes - Crab nebula example
Python Libraries
Numpy array manipulation, some math functions (random numbers, linear algebra, FFT)
Scipy Scientific tools, very powerful
Matplotlib 2-D, 3-D plotting package for Python
Pyephem (angles, dates, coordinate conversions, SIMBAD object lookup)
astro2 library demo (coordinate conversions, precession,