One of the top simulators on the market. Simulates commercial, general aviation, combat, helicopters, and even the space shuttle.
Here you will find a wide range of community created scenery, aircraft, liveries, and plug-ins.
Quality freeware airports and textures.
PROP STRIKE STUDIO
Offers gorgeous hand painted bush flying scenery and a free C172 + taildragger
retrofitted for bush flight.
A massive market of all things flight simulation.
An easy to use flight and route planner
PROJECT FLY V3
Real time flight sim tracker and pilot log book.
Free and most popular virtual air traffic simulator.
Live map of current Vatsim flights
Live air traffic controllers 15 hours a day.
Flight sim news website.
U.S. Airport information, charts.
Aeronautical maps and charts.
Moving charts and navigation data.
QUICK FUEL PLANNER
Simple website for obtaining fuel estimates quickly.
A brilliant plug-in that makes push back from the gate easy and accurate.
Updates the default textures around airports. Adds more refined painted lines and signs.
One of my favorite plug ins as a video producer. Allows you to easily move around the world and create fantastic cinematic views.
Adds a runway advisory system to the simulator.
Adds real time weather data to the sim.
ZIBO MOD 737-800X
Arguably the best rendition of a 737-800 out there. The best part is that it's free, although I highy suggest donating to this project because you will fall in love if you're a fan of the 738.