XFlow CFD is described as 'XFlow is a next generation CFD software system that uses a proprietary state-of-the-art Lattice Boltzmann technology, and is specifically designed for companies which require accurate feedback on flow simulation, transient aerodynamics, water management and fluid-structure'. There are more than 10 alternatives to XFlow CFD for a variety of platforms, including Windows, Linux, Mac, Online / Web-based and GNU Octave. The best alternative is COMSOL Multiphysics. It's not free, so if you're looking for a free alternative, you could try FEATFLOW or SimulationHub. Other great apps like XFlow CFD are ANSYS Fluent (Paid), SimFlow (Paid), FEATool Multiphysics (Free Personal) and COSMOSWorks (Paid).
Code_Saturne solves the Navier-Stokes equations for 2D, 2D-axisymmetric and 3D flows, steady or unsteady, laminar or turbulent, incompressible or weakly dilatable, isothermal or not, with scalars transport if required.