Aerodynamics

XFLR5

XFLR5 is an analysis tool for airfoils, wings and planes operating at low Reynolds Numbers. It includes:

1. XFoil's Direct and Inverse analysis capabilities
2. Wing design and analysis capabilities based on the Lifiting Line Theory, on the Vortex Lattice Method, and on a 3D Panel Method

http://www.xflr5.com/

JavaFoil

JavaFoil is a free program that enables you to perform airfoil analysis. the program takes a set of airfoil coordinates, it calculates the local, inviscid flow velocity along the surface of the airfoil for any desired angle of attack. It also solves a set of differential equations to find the various boundary layer parameters.

http://www.mh-aerotools.de/airfoils/javafoil.htm

XFOIL

XFOIL is an interactive program for the design and analysis of subsonic isolated airfoils. 
It consists of a collection of menu-driven routines which perform various useful functions.

• http://web.mit.edu/drela/Public/web/xfoil/
• http://www.openvsp.org/wiki/doku.php?id=xfoiltutorial