Xfoil... Easy to install and run port of Mark Drela's XFOIL software: drag 'n drop it in your Applications folder and double click on it!
Main features of XFOIL are:
- Viscous and inviscid analysis of airfoils
- Airfoil design and redesign
- Plotting of geometry, pressure distributions, and multiple polars
If you use Mac OS X 10.5.x, set "Access to assistant devices" in "System Preferences"-->"Universal Access"
Open Terminal (/Applications/Utility/Terminal) and write open .bash*
Press return and in each opened file search (⌘ F) in the opened files "display" and delete more...