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DocFetcher - DocFetcher is a portable German/English open source desktop search application.
FSearch - A fast file search utility for GNU/Linux based on GTK+3
X1 Search - X1's Lightning-Fast Search Software. Premium Alternative to Windows Desktop and Outlook Search.
RecentX - RecentX is an innovative launcher that gives you instant access to your files, folders, programs...
AstroGrep - AstroGrep is A Microsoft Windows GUI File Searching (grep) utility.