Paletro - Enable command palette (⇧⌘P) in any application on macOS
OK Google - Explore over 150 Google Now voice commands in one place
Sol - Replace your macOS command palette tool with an open source version, all the perks of advanced tools like raycast or Alfred at your finger tips
kbar - ⌘ kbar is a fully extensible command+k interface for your site.
Osara - Osara brings Command Palette for app menus to all your apps
Magny.io - Magny is a navigation, universal search and helper for apps in order to help users understand app features better and onboard faster, with a focus on increasing user experience.