Freeware flightplanners for IFR and VFR
 

Found a decent freeware IFR flightplanner. It is under developement and currently called a Beta, but functions fine, with a decent interface. Check for your own whether it serves your simulation needs, it surely serves mine to just produce a chain of waypoints I then can enter into an FMC in the sim.

http://www.flightplanpro.eu/Home.html

For VFR flightplans, G-plan is recommended, also free.

http://www.tasoftware.co.uk/