I can't believe I'm posting in Tech/Operations. I read the forum daily but just as an enthusiast and observer.
I use Vroute, which has a pay and free version. It's not too bad.
You can get real world flight planes from the site but it's mostly domestic U.S. Sometimes you can get Int'l flights if the flight leaves from the U.S.
another free flight planning site
TopCat: this is payware. It's an incredible program. It will generate load plans. (their fuel planner isn't great)
I check monthly for updates about PFPX but still no release date.