The best replacement for active sky is rex.

The best alternatives to active sky are rated as following:
★★★★★  rex
★★★  opus
★★  real environment xtreme
★  rex weather
  opusfsx

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Speaking about active sky, one probably shouldn't forget about rex.

Other search terms related to active sky and their ratings are:
★★★★★ rex
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active sky
rex
opus