Continental maps can be done in FTPro. I have a gallery of worlds I generated that should be linked in my sig. To get them you need to pick a function you like, put the settings approximately where you want it, then just start cycling through the worlds until something pops up that looks semi-reasonable. Then you start tweaking the world generation settings to see if you can improve it. Then once you have it as close to what you want as you can, then you start doing the hand-editing (or script-editing, if you're into that like I am).