Mission X is a free open source multiplatform space shooter written in java featuring kick-ass graphics and OST. Languages: English, Italian. Last update: July 23, 2010. Trailer and more screenshots: missionx.fdossena.com
GaugeBook displays Gauges of your FSX (with SP2 or Acceleration) and gives you control over a lot of Settings. Change Frequencies, QNH, etc with a few mouse clicks. It's still beta but the new G1000 is a blast. Runs smooth on any notebook.