Smart Launcher is described as 'We designed Smart Launcher for people who need a more efficient and smart way to use their Android devices' and is a Application Launcher in the OS & Utilities category. There are more than 50 alternatives to Smart Launcher for Android, Android Tablet, F-Droid, Kindle Fire and Android SDK. The best alternative is Nova Launcher, which is free. Other great apps like Smart Launcher are Lawnchair Launcher (Free, Open Source), KISS Launcher (Free, Open Source), Microsoft Launcher (Free) and Trebuchet (Free, Open Source).
Nova Launcher is an highly customizable, performance driven, home screen replacement for Android 4.0+ FEATURES • Color Themes • Icon Themes • Scrollable Dock (Keep all your favorite apps on the dock, with up to 7 icons per page and up to 3 pages.
The rootless Pixel Launcher that is both heavily customizable and ships with backported Android Oreo features and tweaks. Based on Launcher3 from AOSP, Lawnchair has all the features of the Pixel Launcher (including the Google Feed), plus customizability.
Trebuchet launcher is an AOSP (Android Open Source Project) based launcher developed by LineageOS team. This is a port of the popular LineageOS 15 ROM's Trebuchet launcher to enjoy on any device; working with any android version equal or greater than Android 5.x.