When it comes to the best blender add-ons that proved to be most useful for the blender this is the list of best Paid add-ons for blender

Introducing Another Great Nature Asset Pack "Arbor". This Nature asset pack Consists of Trees, bushes, herbs, grass, vegetations, etc....

Blaze is and awesome cinematic fire fx shader add-on made for blender. and now Version 1.2 is released for blaze add-on.