Eric Marciano has released a new add-on for FSX and FS2004, EasyFMC. This is a universal Flight Management Computer that can be installed in any aircraft of your collection. It allows the full creation of a flight plan and provides flight guidance without needing any navigation database. It also provides useful features for navigation and comes with 2 look-and-feels: Airbus and Boeing 737.
For more information visit the EasyFMC homepage.