Everything by Voidtools - Everything. Locate files and folders by name instantly. Everything. Small installation file. Clean and simple user interface.
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.
DocFetcher - DocFetcher is a portable German/English open source desktop search application.
Lacona - Fast, simple, powerful keyboard-driven commands for Mac
X1 Search - X1's Lightning-Fast Search Software. Premium Alternative to Windows Desktop and Outlook Search.
Power Menu for Finder - The workflow enhancing Finder extension for Mac