DocFetcher - DocFetcher is a portable German/English open source desktop search application.
Everything - Everything. Locate files and folders by name instantly. Everything. Small installation file. Clean and simple user interface.
FSearch - A fast file search utility for GNU/Linux based on GTK+3
Copernic Desktop Search - Copernic Desktop Search is a downloadable tool for your PC that helps you locate specific documents, emails, and other files.
Locate32 - Locate32 is software which can be used to find files from your harddrives and other locations.
X1 Search - X1's Lightning-Fast Search Software. Premium Alternative to Windows Desktop and Outlook Search.