I really like
skyvector.com. Not the most intuitive to use, but there are some good tutorials out there.
You can map out your route, then send an email to yourself with the plan in foreflight format. Open the email on your phone and it will start your foreflight app, then you can send it to the panel via wifi (Dynon for me).
I also can email myself a PDF flight planner and just print it out at home for a paper copy of the flight. Always nice to have a paper copy to write information on, and as a backup for any electronic glitches.