This list will contain links to add-on aircraft being developed/released, along with the name of the developer. The list will be updated often. There is a list similar to this on Hovercontrol.com for helicopters. I liked it, and I thought it would be a great addition to the forums.
Freeware
Agusta AW139 - By Chris Ekert/Hovercontrol Community for FS9/FSX
Released
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Beech Bonanza - By Brett Henderson for FSX
Released
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Bell 210 - By George A.Arana for FS2004
Released
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Bell 407 - By Nate Rosenstrauch for FS9/FSX
Under Development
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Bristol Superfreighter - By garryrussell for FS9/FSX
Under Development, but can be downloaded from the link
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C-17 Globalmaster III - By UKMIL
Released
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Cheetah D - By JakesF14 for FS9
Under Development
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HD - 1 Swift - By Harold Dickert for FS9
Under Development
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JBizz Jet - By JakesF14 for FS9/FSX
Released - V2.3 (Ongoing project)
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Hughes 600X - By Hughes-MDflyer4 for FSX
On Hold, May not continue
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Sikorsky S-61 - By Hughes-MDflyer4 for FSX
Under Development
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Some Sound System thingies - By skoker for FSwhatever
Under Development, or so you think...
Space Shuttle Atlantis - By Fitzgerald for FSX
Released
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Payware
Agusta A109 - By Milviz/Nemeth Designs for FSX
Under Development
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Bell UH-1H Huey - By Dodosim for FSX
Under Development
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Bell 206B JetRanger III - By Dodosim for FSX
Released
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Boeing CH-47 Chinook - By Milviz/Nemeth Designs for FSX
Under Development
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MD 902 Explorer - By Nemeth Designs for FSX
Released
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Sikorsky S-64 - By Milviz/Nemeth Designs for FSX
Released
If you know of any add-ons that aren't on the list, or have a better link, please make a post.
Enjoy,
Brandon