HIFI TECH - ACTIVE SKY XP X-PLANE 11
This is the most accurate and advanced weather engine for X-Plane 11. It is very easy to use. Inside it has 2 types of clouds: Low Perf/High Perf. But I prefer to use the default one. 10 wind shears out of 10!
HIFI TECH - ACTIVE SKY 2016 FSX
Best Weather Engine for FSX! It is also can upload weather data to PFPX and other supported software.
HIFI TECH - ACTIVE SKY CLOUD ART FSX P3D3-6
Best clouds and sunsets for FSX/P3D. The interface is quite simple. Also, it supports customized textures. So you can create custom texture packs.