MathReader is a free read-only viewer for notebooks. It is available from the web (www.wolfram.com/mathreader).
MathReader lets you:
display any notebook, animate graphics, and play sounds
copy and paste text and graphics from the notebook
print the notebook
To create or modify a notebook you need a complete Mathematica front end. To do computations, a complete Mathematica system, including the Mathematica kernel, is required.