The best replacement for cairo dock is docky.

The best alternatives to cairo dock are rated as following:
★★★★★  docky
★★  awn
★★  avant
★  plank

Your alternative for cairo dock is not listed? Suggest!
Speaking about cairo dock, one probably shouldn't forget about gnome 3.

Other search terms related to cairo dock and their ratings are:
★★★★★ gnome 3
You have in mind a companion for cairo dock and it is not yet here? Propose!



Google Trends

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cairo dock
docky
awn