If you're going to add to the list, please provide links to the item you're recommending and
add anything you'd like as long as it's freeware.
Here are a few of my favorite freewares to get things started:
T-45 Goshawk by Dino Cattaneo
Kauai and Niihau Photoreal scenery by Rich Sorochak
Nimitz Aircraft Carrier Package by Javier Fernandez and AI Carriers by Lamont Clark