HIST or Hanley Innovations Surface Treatment is a novel algorithm for obtaining at least 2nd order accuracy on arbitrary boundaries. HIST enables ActualGeometry/CFD which provides stable CFD computations without the need to defeature your geometry.
MultiElement Airfoils (Lite Edition) is a unique software package for computing the lift, drag and moment coefficients for multiple interacting airfoil shapes. It is based on a linear strength vortex panel method coupled with a boundary layer solver. More information.
3DFoil is the ideal tool for interactive analysis and design of multiple lifting surfaces. The software uses a vortex-lattice method to compute lift and induced drag. The profile drag is computed using a novel algorithm. 3Dfoil computes lift, drag, moments and longitudinal/lateral stability derivatives. More information.