Anytxt Desktop Search - Anytxt is Desktop Search Tool with A Powerful Full-Text Search Engine.
dtsearch - dtSearch - The Smart Choice for Text Retrieval since 1991.
TextSeek - TextSeek helps you search document contents for Windows and MacOS within seconds, including PDF, Word, Excel, PowerPoint, and other formats.
SearchMyFiles - Alternative to the standard Search For Files And Folders module of Windows. Duplicates search is also supported.
Everything by Voidtools - Everything. Locate files and folders by name instantly. Everything. Small installation file. Clean and simple user interface.
DocFetcher - DocFetcher is a portable German/English open source desktop search application.