From LQWiki

YS Flight Simulation System 2000 is a 3D Flight Simulation with Open Source add ons.

Features

• Over 50 default aircraft.
• Multiplayer Network play.
• OpenGL support but not required.
• Low CPU requirements

3rd-party addons

Global Tribunal Realism Pack
includes:

• a rebuild of over 50 aircraft
• more realistic performances
• protection against cheats
• linux build package (with joystick support)
• 3rd party add on packs including SnowBirds, BlueAngels, ThunderBirds ...

External links

• Offical website (www.ysflight.com)