Orb is a Python based YSFlight Server Extension. It works by having ysflight run on a seperate port, and orb running on 7915 (usually). Clients connect to Orb, and Orb then connects them to the server. packets are intercepted, read and edited if need be to manipulate the server to have more power. Fuse this double relay method with a database, and basic functions with the possibility to extend, and Orb becomes immensly powerful.
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.