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Links to Add-ons for Microsoft Flight Simulator and Lockheed Martin Prepar3D
Microsoft Flight Simulator (MSFS)
Microsoft Flight Simulator Microsoft Flight Simulator (MSFS) is developed by Asobo Studio and published by Xbox Game Studios. The entire Earth is simulted using data from Bing Maps. Three editions available at three price points.  Compare editions...   Also available for Xbox... Microsoft Flight Simulator 2020
MSFS Forums Offical forums for Microsoft Flight Simulator. Categories include; Community News and Events, Guides, Flying, ATC, User Screenshots (check out Real vs. Sim Screenshots thread), Aircraft, Multiplayer and more. 
FSX-Steam Edition Developed by Dovetail Games for the Steam platform, FSX Steam Edition (FSX-SE) is an earlier version of Flight Simulator offering multiplayer options while retaining full backward compatibility with FSX add-ons.  FSX-Steam Edition
Prepar3D
(P3D)
Prepar3D is a 64-bit flight/sea/land simulator developed by Lockheed Martin from the Microsoft FSX code with performance improvements, greater stability and new functions. Version 5.3 and hotfix 1 released. Prepar3D by by Lockheed Martin
Prepar3D
Forums
Official Lockheed Martin P3D support and discussion forums. They include specific forums for discussing issues with installation, normal and multiplayer use, hardware, SimConnect, screenshots. Prepar3D Forums
Prepar3D Help
& SDK
Access the official P3D Learning Center and SDK here. Learning Center offers users information on aircraft, controls, navigations, missions and views. SDK sets out parameters for developers and describes use of built-in utilities. Prepar3D Help & SDK
Flight Sim News Sites
Flight Sim Association FSA is a community of flight simmers pilots and developers that offers in-person events, getting started guides, webinars, and more. Free membership option. FSA hosts FlightSimExpo, North America’s flight sim conference and tradeshow.  
FSNews Flight simming news feed covering P3d MSFS and X-Plane. News, guides, software and hardware reviews. "The Workshop" is a serious dedicated to the latest news and updates regarding FlyByWire’s work on the MSFS A32NX. 
FSElite New, reviews and editorials. Delivering ‘news-worthy’ articles, free from unfounded rumour or speculation. If we report something, we’ll source it so you know what we’re saying is right.  FSElite
MSFSAddons
.com
The latest news and releases for Microsoft Flight Simulator. Categories include aircraft, scenery, missions, freeware and utilities. Beware of misleading download links from advertisers. MSFSaddons.com
PC Pilot PC Pilot is an A4, full colour, flight sim magazine published bi-monthly. Every issue is packed with news, advice and features on all aspects of flight simulation and well-respected reviews. On-line subscriptions. PC Pilot logo
Reddit
r/flightsim
Flight sim communities on Reddit - r/flightsim - For all those who love to fly the virtual skies..  r/prepar3d -Prepar3D forum.  r/MicrosoftFlightSim - general MSFS discussions. r/MSFSPhotos - MSFS screenshots.  Reddit flightsim logo
SimFlight English portal of a network of international sites - Benelux & Netherlands, China, France, Germany, Italy, Japan, Portugal & Brazil, Russia, Spain. Up-to-date FS news, reviews, many general and product forums, links and simMarket. SimFlight
Threshold We believe you deserve an impartial view on important subject matters. Our writers think independently, are not tied to any products or developers, and wield criticism only when justifiable.  News, forum and on-line store.
Flight Sim Downloads Sites
Avsim A huge and popular flight sim portal with thousands of downloads for current and earlier versions of MSFS and other flight sims. News, reviews and many forums. Totally free. Donations welcomed. Avsim logo
FlightSim
.com
Flight simulation news and reviews, downloads, forums, FAQs, navigation tutorials, screenshots and links. Free download libraries and forums. An optional subscription gives faster downloads. Online software store... FlightSim.com logo
Flightsim
.to
Download aircraft, aircraft liveries, mods, scenery and untilities for MSFS. Also has a news hub and sceneray map. Some downloads require flightsim.to site registration (free).
Fly Away Simulation Flight simulation news and reviews, downloads, forums, FAQs, navigation tutorials, screenshots and links. Completely free MSFS, FSX, FS9 & P3D downloads and forums. Optional subscription gives faster downloads. Fly Away Simulation
FS Freeware
.net
Freeware aircraft, scenery and tools downloads for FS2004, FSX and Flight Gear. Fast downloads require registration. FS Freeware.net
Nexusmods MSFS mods for scenery, aircraft, performance, visuals etc. Also includes liveries, tools and utilities.
Rikoooo A collection of freeware downloads for FS9, FSX and P3D. Includes aircraft, scenery and utilities. Also screenshots and videos. Optional, low cost, subscription gives faster downloads. French and English language. Rikoooo
Simviation Many gigabytes of quality freeware add-ons nicely organised by type. Includes aircraft, panels, scenery & utilities. Also offers help with installing them, news, reviews, VA message board and more.  Simviation
SurClaro Flight Simulations Large, long established flight simming resource offering thousands of freeware and shareware downloads (free registration required), forums, chat rooms and screenshots. Also hosts an on-line shop. Mostly FSX and P3D.  SurClaro Flight Simulations
Wizzsim
.com
Freeware downloads for FS98 through to the lateste MSFS, P3D and X-Plane. Includes aircraft, aircraft liveries, scenery and utilities. Also has flight sim forums, news and links.