DocFetcher - DocFetcher is a portable German/English open source desktop search application.
Everything by Voidtools - Everything. Locate files and folders by name instantly. Everything. Small installation file. Clean and simple user interface.
FileLocator - FileLocator Lite enables you to locate files on your pc.
Regain OST Converter Tool - Professional utility to repair or convert offline OST files to Outlook PST file.
Recoll - Recoll is a desktop full-text search tool. Recoll finds keywords inside documents as well as file names.
SearchMyFiles - Alternative to the standard Search For Files And Folders module of Windows. Duplicates search is also supported.