Not sure what level of flying complexity you are looking for. For basic VFR flying you could try the nifty flight planner software available free from a website which I cannot presently find, but you could try emailing the author Brian Samson who is, or used to be, at
[email protected]. Saves a bit of whizz wheel work and is better than a GPS because it still requires you to look out of the window (rule 1 in every GPS manual seems to be "Fly along with your head in your lap")