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Links to Add-ons for Microsoft Flight Simulator and Lockheed Martin Prepar3D
Environment - Sky - Clouds - Weather - Water - Lights
A2A Simulations Home 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. A2A Simulations
Cielosim Flight 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. Cielosim logo
Creative Design Studio Environment add-ons for FSX & P3D by Chris Bell. Includes country-specific night environments adding hundreds of lights, Stargazer, and Black Marble & Blue Marble world environments. On-line shop & forum. Chris Bell Studio logo
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! CumulusX!
Envtex by Toga Projects Payware 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.  Envtex  logo
FireFighter X This 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. FireFighter X
FS Global Real Weather FS 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 Global Real Weather
FS Meteo Interfaces 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. FS Meteo
FSrealWX Weather add-on for FS9, FSX, P3D and X-Plane. It decodes METAR and upper wind data (additional weather information such as types of clouds are in preparation) and sends it to the flight simulator. FSrealWX
HiFi Technologies (Active Sky) Home 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. HiFi Technologies logo
iniBuilds Dynamic Lighting, GSX Profiles and presets for PTA and Reshade. Also home of iniVA a fleet management service for your virtual airline! iniBuilds logo
Night Environment by Chris Bell A series of commercial add-ons for FSX & P3D. Using various databases they add thousands of lights to roads and other areas. Individual country and area packs for Europe, parts of the USA and elsewhere.
Night Environment by Chris Bell
Open Clouds A 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. Open Clouds
OPUS FSI A 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.
Opus Software
Parallel 42 PrecipitFX 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. Parallel 42 logo
REX Weather Force WeatherForce 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. REX Simulations logo
 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.
FSXWX A free weather engine that depicts the live weather in FSX/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.
Zinertek Technologies Producers of Ultimate Night Environment, World Environment Pro, Ultimate Water, & Ultimate Airport Environment for FS9 & FSX, and HD Airport Graphics and Tree Environment X fto enhance FSX and P3D night, day, airports and trees. Zinertek Technologies logo
Chris O-Design Chris.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. Chris O-Design logo
Envshade Envshade 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 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 FXAA Tool
NZFSim Some 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. NZFSim
Reshade An 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. Reshade  logo
SweetFX at SweetFX can apply post-processing shader effects to FSX and P3D to add anti-aliasing, sharpening & colour tweaks. Avsim Forum Thread... logo
SweetFX Settings DB Comprehensive database listing SweetFX presets for loads of games incluing Flight Simulator X and Prepar3D - several presets for both. SweetFX Settings DB