Gas Dynamics Toolbox
 

A while ago I wrote an applet for the Java course and I put it on the web recently. As far as I know that's the only available applet online to calculate mean free path for mixtures of gases, Reynolds number, specific heat ratio for imperfect gas etc.

Please, give it a try: http://www-rcf.usc.edu/~alexeenk/GDT/

I'd appreciate any comments on how to make it more useful.