Ace Online is an intense, flight-action space shooter, with a focus on player vs player combat.

AirBlast is an older 3D flight simulator in which you must train before entering advanced modes.

Bad Bunch is a cartoon-like aircraft PVP game focused on team-based play with the ability to host or join servers.

Dogfight: Battle In The Skies is am Amiga clone of the same name featuring single or multi-player action for up to 2 players on one computer.

FighterPilot is a combat flight simulator in which players fly a fourth generation jet aircraft on a series of missions to eliminate enemy targets.

flightcombat_chung is a 3D openGL space, air, sea and ground flight simulator featuring combat against ships and massive air /air /space dogfights.

FlightGear is a free, Open Source flight simulator in development since 1996 and features many additional planes, helicopters, and scenery updates you can download.

FMS (Flying Model Simulator) is an RC Flight Simulator featuring several of their real model RC airplanes to train on before flying the real thing.

Limit Load is a cockpit flight game featuring modern military jets. It is more an arcade game than a simulation, as the level of realism has been adjusted to provide action-packed gameplay.

Feel the power at your fingertips as you take to the skies and launch into thrilling missions and exciting challenges over the free-to-play Big Island of Hawaii.

Moon is an Open Source, portable app that allows you to design space missions for educational or experimental use.

mywebglflight chung is a online 3D webgl flight / car simulator with shaders written in HTML5 and javascript.

A free, fully featured model rocket simulator that allows you to design and simulate your rockets before actually building and flying them.

Orbiter Space Flight Simulator is a free hardcore space flight simulator designed to give you a real feel for what space feels like.

Pencil BiPlane Battle is a fun arcade shooter that has you fighting enemy aircraft in a black and white, hand-drawn world.

Project Apollo - NASSP is an add-on for the Orbiter Space Flight Simulator.

RASAero II is a combined aerodynamic analysis and flight simulation software package for model rockets and high power rockets, amateur rockets, and sounding rockets.

Rise of Flight is a next-generation WWI combat flight simulator for the PC.

Sky Dawgz is a top-down aerial dogfighting arcade game with WWII airplanes.

War Thunder is a next-generation MMO combat game dedicated to World War II military aviation, armored vehicles, and fleets.

When Pigs Fly you have to build a plane for your pig and then fly it to see how far or how fast you can go.

Wings Of Fury 2 is a FREE remake of the 1987 classic WW2 plane simulator game - Wings Of Fury.

World of Warplanes is a multiplayer online game dedicated to the "golden age" of the world's combat aircraft.

With X-Plane, you also get one of the most realistic sims on the market. It’s not free, but then again very few are and certainly nowhere as complete as this one.

Xmas 1940 puts you in the role of Santa Claus delivering presents with an armored airplane instead of a sleigh while avoiding or fighting enemies.

YS Flight Simulator is a decent, freeware flight simulator that's only about ten megs.