Listary - Listary is a revolutionary search utility for Windows
grepWin - grepWin is a simple search and replace tool which can use PCRE regular expressions to search for...
Keypirinha - A lightning fast and flexible keystroke launcher for Windows. No installation required (portable).
DocFetcher - DocFetcher is a portable German/English open source desktop search application.
Synapse - Synapse is a semantic launcher written in Vala that you can use to start applications as well as find and access relevant documents and files by making use of the Zeitgeist engine.
dnGREP - dnGrep allows you to search across files with easy-to-read results.