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Links to Add-ons for Microsoft Flight Simulator and Lockheed Martin Prepar3D
Environment - Sky - Clouds - Weather - Water - Lights
A2A Simulations A2A SimulationsHome of 3D Lights REDUX aircraft lighting system that casts realistic light into 3D space, creating stunning visuals and an immersive flying experience. Installs to default and third party add-on aircraft. For FS9, FSX and P3D.
Campout A unique add-on utility for MSFS from Parallel 42 allows you to take camping equipment on board any aircraft. Set up camp anywhere you want. It's not scenery; it's live & dynamic object placement and management via an in-sim menu system. Combine the beauty of flying with the vibes of camping.
Cielosim Cielosim logoFlight Enhancer and Instant Enhancer for FS9 improve many of the original textures and effects. Also, Live ATC Chatter for FSX and Airport Enhancer HDX for FSX & P3D to improve runways, taxiways, marking and signs, wet, etc.
CumulusX! CumulusX!CumulusX! by Peter Lürkens, creates a thermal environment in FSX for virtual gliding. It creates thermal lift with appropriate clouds either on the fly or based on customised lists of thermals. Also, other glider utilities, including WinchX!
Envtex by Toga Projects Envtex  logoPayware texture enhancement add-on offers a new immersion level to FS9, FSX, and Prepar3d, with high-quality textures and effects. Developed with FPS & VAS in mind. Highly customisable for best performances. 
FS Global Real Weather FS Global Real WeatherFS Global Real Weather is an easy-to-use weather engine with a simple, clean interface for FSX, FS9 and P3D. Delivers weather calculated from 24,000 land- and sea-based real-world stations. Also calculates air masses and temperatures.
HiFi Technologies (Active Sky) HiFi Technologies logoHome of Active Sky 64bit high fidelity weather simulation designed specifically for FSX and P3D. Features include smooth visual cloud transitions, dynamic processing and a weather radar.
Open Clouds Open CloudsA weather programme that improves the look of cloud and fog coverage in FSX and extends the distance views of clouds. It also works with Rex textures and Prepar3d. Free for UK coverage; small change fee for the rest of the world.
OPUS FSI Opus SoftwareA sophisticated interface for FSX and Prepar3D with Live Weather Engine for real-world weather, Live Camera for view control & dynamic head movements. Live view for multi-screen networked displays. Weather map. Payware & demo.  New! OpusMSFS Interface for MSFS 2020.
Parallel 42 Parallel 42 logoPrecipitFX is a set of textures and effects that completely revamp contrails, rain and snow textures and improve wheel spray and engine wash effects in FSX and P3D.
RealTurb
(@ SimMarket)
RealTurb CAT Areas Global for MSFS extends the RealTurb effects to the SIGMET CAT and SIGMET TS (Thunderstorm) areas found around the world. Also, RealVolMet Europe which aims to raise the immersion level by including European VHF VolMet stations providing more accurate weather reports.
REX Weather Force REX Simulations logoWeatherForce for MSFS produces automated real-world weather transitions and a wide range of proprietary dynamic weather presets. Also, Rex Accuseasons Advanced for tree & vegetation seasonal presets and options.
 SoFly Improve your simulator with our World Enhancer range of products. Includes Weather Preset Pro, which adds over 40 custom-made presets to MSFS that cover a wide range of weather. It can add deeper snow layers and increased precipitation. Also, other environment and weather add-ons.
Taburet (@ SimMarket) Producers of useful scenery for MSFS, FSX, P3D and X-Plane. Products include replacement vector and photorealistic scenery for cities, countries and continents. Roads of Italy, the UK, Canada and others. Icey lakes for Alaska and Scandinavia and 'Night 3D' night lighting. Also at FlightSim Store...
Shading
Chris O-Design Chris O-Design logoChris.O - Elite v2.0.2 (low-cost payware) is an easy way to enhance your visual experience in Prepar3d v4+ and MSFS. Other downloads include Supreme and Ultimate versions, and presets for TomatoShade and Reshade.
Envshade Envshade from Toga is an exclusive shaders enhancement for Envtex (see above) and Prepar3D. It pushes the realism of your simulator with realistic shaders reacting to environment variables like weather, time of day, altitude... etc.
FXAA Tool FXAA ToolFXAA Tool injects different post-processing methods into FSX, like anti-aliasing, sharpening, bloom, and colour tone. Its anti-aliasing process is done with virtually no impact on system performance. Comes with its own GUI. Last updated 2013
RDShade The ultimate shader and tweaking tool for Prepar3D. Customise P3D by adjusting countless values to make your simulator look more realistic. Creating a preset and adjusting your shaders has never been easier. Adjust your shaders, colours and tweaks while P3D is running. (scroll down the webpage).
Reshade Reshade  logoAn advanced post-processing injector for games and video developed by Crosire. It can add or improve ambient occlusion, real depth of field effects, colour correction and more. reShade allows you to tweak "live" in real-time.
SweetFX at Guru3D.com Guru3D.com logoSweetFX can apply post-processing shader effects to FSX and P3D to add anti-aliasing, sharpening & colour tweaks.
SweetFX Settings DB SweetFX Settings DBComprehensive database listing SweetFX presets for loads of games, including Flight Simulator X and Prepar3D - several presets for both.