Nova Launcher
Nova and Apex (below) are the two standout Android launchers - both strike an excellent balance between having enough features to customise things, without bogging you down with unfeasibly long options lists and 17 levels of sub-menu hell.
Nova's arguably the better of the two, with a few more options available in the free version (there is also a Prime version), and slightly better performance - but really, we're splitting tiny Android hairs trying to find a difference between the two.
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