HayaiLauncher is described as 'It is a fast, lightweight Android Launcher. It is free/libre software'. There are more than 25 alternatives to HayaiLauncher for Android, Android Tablet, F-Droid and Kindle Fire. The best alternative is Nova Launcher, which is free. Other great apps like HayaiLauncher are Lawnchair Launcher (Free, Open Source), KISS Launcher (Free, Open Source), Trebuchet (Free, Open Source) and OpenLauncher (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.
You can easily add any app launcher, so you won't ever again have to swipe through useless apps to find the one you need. You can also rename the launchers as you wish. It is not a real launcher replacing your home screen, just a holder for your favourite apps.