The Project Opensky Archive is a website assembled to archive the great freeware that was created by Project Opensky for the Flight Simulation Community. It is maintained in an effort to keep those efforts available to the community forever.
The archive contained on this website is the latest set of files from Project Opensky before their website was taken offline.
Many people have been asking about Project Opensky support for FSX and it does exist/work. Learn how to make Project Opensky work on FSX.