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DocFetcher - DocFetcher is a portable German/English open source desktop search application.
Recoll - Recoll is a desktop full-text search tool. Recoll finds keywords inside documents as well as file names.
X1 Search - X1's Lightning-Fast Search Software. Premium Alternative to Windows Desktop and Outlook Search.
Keypirinha - A lightning fast and flexible keystroke launcher for Windows. No installation required (portable).
Anytxt Desktop Search - Anytxt is Desktop Search Tool with A Powerful Full-Text Search Engine.