The best replacement for fumefx is phoenix fd.

The best alternatives to fumefx are rated as following:
★★★★★  phoenix fd
★★★★  krakatoa
★★★  turbulencefd
★★★  houdini
★★  afterburn
★★  maya fluids
★★  realflow

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Speaking about fumefx, one probably shouldn't forget about krakatoa.

Other search terms related to fumefx and their ratings are:
★★★★★ krakatoa
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