After a few years I still use Listary as my main search/launcher. It's very quick, has a very nice look and great system of filters and projects. There are problem with new version to be released, but I'm talking about version number 5.
GNU Find Utilities - The GNU Find Utilities are the basic directory searching utilities of the GNU operating system.
Keypirinha - A lightning fast and flexible keystroke launcher for Windows. No installation required (portable).
NTFS-Search - This tool enables users to search their NTFS formatted harddrives within seconds.
Alfred - Alfred is an award-winning app for macOS which boosts your efficiency with hotkeys, keywords, text expansion and more. Search your Mac and the web, and be more productive with custom actions to control your Mac.
fd - A simple, fast and user-friendly alternative to 'find'.
Wox - An effective launcher for windows. A full-featured launcher, access programs and web contents as you type. Be more productive ever since. Wox is free for use and open-sourced at Github, Try it now! Download .