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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 2020Microsoft Flight Simulator 40th Anniversary Edition (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... and on Steam... 
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. 
Microsoft Flight Simulator 2024 In June 2023 Microsft announced that a brand new version of MSFS for PC, XBox and Steam would be published some time in 2024. Link has screenshopts and link to YouTube announcement trailer.
FSX-Steam Edition FSX-Steam EditionDeveloped 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 original FSX add-ons. 
Prepar3D
(P3D)
Prepar3D by by Lockheed MartinPrepar3D 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. 3D cockpits, flight planner, world-wide realistic scenery, accurate topography, interactive ATC, underwater simulation etc. Version 6.1.  released.
Prepar3D
Forums
Prepar3D ForumsOfficial Lockheed Martin P3D support and discussion forums. They include specific forums for discussing issues with installation, normal and multiplayer use, hardware, SimConnect, screenshots.
Prepar3D Help
& SDK
Prepar3D Help & SDKAccess 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.
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 FSEliteNew, 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. 
MSFSAddons
.com
MSFSaddons.comThe latest news and releases for Microsoft Flight Simulator. Categories include aircraft, scenery, missions, freeware and utilities. Beware of misleading download links from advertisers.
PC Pilot PC Pilot logoPC 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.
Reddit
r/flightsim
Reddit flightsim logo 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. 
SimFlight SimFlightUp-to-date FS news, reviews of software and hardware, many general and product forums, links and simMarket.
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 Avsim logoA 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.
FlightSim
.com
FlightSim.com logoFlight 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
.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 Fly Away SimulationFlight 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.
MSFSaddon.com msfsaddon.com is a page that shares free add-ons and mods for Flight Simulator 2020. In principle, we do not share every extension. We only share quality plugins and best quality addons.
Nexusmods MSFS mods for scenery, aircraft, performance, visuals etc. Also includes liveries, tools and utilities.
Rikoooo RikooooA 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.
Simviation SimviationMany 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. 
SurClaro Flight Simulations SurClaro Flight SimulationsLarge, 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.