Dan's Orbiter page with DGIII and Orbiter sound.  Site de la communauté francophone d'Orbiter  (Documentations, forum)  
Orbiter, official website (with forums)
  Le manoir des 3 portes Actualité sur Orbiter (in french)  
 

Orbit Hangar

 Addons  librairy  
  Avsim Addons librairy  
  Interplanetary MFD Addons MFD  
  VINKA's module Modules spacecraft3 and multistage3  
  Simcosmos links All the websites links about Orbiter  
  SCHMIZ's ORBITER addons All addons by Schimz (DGex)  
 

Falcoleprof's website

  News, video, pack, tuto, etc  
 

Aerobrake MFD

  Trajectory calculator of a winged ship in a atmosphere.