Epsilon is basically a set of plugins for ParaView . ParaView has been selected as a platform because it is open source, user-friendly and widely used by the CFD community. The plugins allows Paraview to execute several Python files that calculates the aerodynamic parameters.
The user simply has to load its CFD/experimental data into Paraview and to execute Epsilon Aero Data (The main Epsilon plugin). Then, he is ready to perform an aerodynamic analysis by using the native Paraview tools.
Easy to use: a user that is already familiarized with Paraview will learn all the Epsilon capabilities very quickly.
 ParaView website