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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 which casts realistic light out 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 that 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 texture 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 addon offering a new immersion level to FS9, FSX and Prepar3d with high quality textures and effects. Developed with FPS & VAS in mind. Highly customizable for best performances. 
FireFighter X FireFighter XThis addon app is not mission-based, but instead puts you in a completely dynamic scenery environment, where fires live and grow, are aware of weather and generate updrafts.  Test your skills at putting them out using any aircraft. For FSX and P3D.
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.
FS Meteo FS MeteoInterfaces with all versions of MSFS, CS2 and Prepar3D, detects where the plane is, reads the weather from the Internet and modifies the weather parameters. Weather gauges also available. Shareware. Demo available.
FSXWX A free weather engine that depicts the live weather in FSX and P3D. You can expect results that are not only accurate but also beautiful! FSXWX generates its own weather grid system and enhances the presentation of the weather. Donationware. New URL.
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 programe that improves the look of cloud and fog coverage in FSX and extends the distance views of clouds. Also works with Rex textures, and Prepar3d. Free for UK coverage, small change 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 (Clear Air Turbulence) and SIGMET TS (Thunderstorm) areas, found around the world. Also RealVolMet Europe that aims at raising the immersion level by including European VHF VolMet stations, with their correct, real life naming, frequency providing the real 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 for tree & vegetation seasonal presets and options.
 SoFly Authors of Weather Preset Pro that adds over 40 custom made presets to MSFS that cover a wide range of weather. Goes beyond the built-in system by adding deeper snow layers and increased precipitation. Purchase via Orbx.
Taburet (@ SimMarket) Producers of useful scenery for MSFS, FSX, P3D and X-Plane. Products include replacement vector and photorealistic scenery for cities, countries and whole continents, roads of Italy UK  Canada and others, icy lakes for Alaska and Scandinavia and 'Night 3D' night lighting. Also at FlightSim Store...
xEnviro 2020
(@ Threshold Store)
Originally made for X-Plane, xEnviro 2020 is a MSFS version. Real-time meteorological data with a selectable refresh intervals. Atmosphere condition based on dynamic air parcel prediction model used for real aviation research and training. Advanced atmosphere topology methods provide accurate cloud thickness and density prediction. 
Zinertek Technologies Zinertek Technologies logoProducers of Ultimate Night Environment, World Environment Pro, Ultimate Water, & Ultimate Airport Environment for FS9 & FSX, and HD Airport Graphics and Tree Environment X to enhance FSX and P3D night, day, airports and trees. Also Enhanced Airport Graphics for MSFS 2020
Shading
Chris O-Design Chris O-Design logoChris.O - Elite v2.0.2 (low-cost payware) is a 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 a 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 to FSX, like anti-aliasing, sharpening, bloom, color tone. Its anti-aliasing process is done with virtual no impact on system performance. Comes with its own GUI. Last updated 2013
NZFSim NZFSimSome useful information, setting, presets and tweaks for Tomatoshade and PTA in P3D. Also has FSX and aircraft repaints in New Zealand military and civil liveries for freeware and payware aircraft, including default aircraft.
RDShade The ultimate shader and tweaking tool for Prepar3D. Customize P3D by adjusting countless values to get your simulator to look even 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 webpage).
Reshade Reshade  logoAn advanced, post-processing injector for games and video developed by crosire. Can add or improve ambient occlusion, real depth of field effects, color 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. Avsim Forum Thread...
SweetFX Settings DB SweetFX Settings DBComprehensive database listing SweetFX presets for loads of games incluing Flight Simulator X and Prepar3D - several presets for both.