I love freeware... TDS 737's 787's are amazing (after rigorous testing to my personal opinion on performance like endurance, climb perf and braking). There is no free C-130 worthy unless you want a very heavy King Air performing aircraft. C-5 is also very unlikely. The captainsim C-130 Xperience was a respectable product (I don't kno if it is still available or what cost). Just be prepared that most freeware aircraft will be heavily based off default planes..... A free Arrow will likely fly just like the C172 with maybe better speed and different fuel flow. Freeware developers Project Airbus, Project Opensky/Skyspirit, TDS, Dreamwings, off the top of my head are a little more developed. Free is still wonderful. Just don't assume you're flying a genuine representation. FS will always have it's limitations. (Even PMDG has a few shortcomings). Happy Simming!