Witch - Welcome to the world of W. i. t. c. h.
Nova Launcher - Nova Launcher is an highly customizable, performance driven, home screen replacement for Android 4.
Contexts - Switch between application windows effortlessly — with Fast Search, a better Command-Tab, a Sidebar or even a quick gesture. Free trial available.
KISS Launcher - KISS is a fast launcher for your Android.
Hyperswitch - HyperSwitch provides a compelling alternative to HyperDock for keyboard junkies. What's New
Lawnchair Launcher - A better Pixel Launcher