IFaRi is a new, faster version of a IFR Planner, Navigator / Autopilot. It should replace Navari in the near future.
It is written in C# with OpenGL.
It can be used to create a real IFR route, by clicks, for the enclosed autopilot
It can be used for FSX or P3D(FSUIPC) and X-Plane(XPUIPC).
IFaRi V2.5 can be downloaded here
Read the ReadMe file.
Check the more detailed Manual.