Listary - Listary is a revolutionary search utility for Windows
dnGREP - dnGrep allows you to search across files with easy-to-read results.
Keypirinha - A lightning fast and flexible keystroke launcher for Windows. No installation required (portable).
grepWin - grepWin is a simple search and replace tool which can use PCRE regular expressions to search for...
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.
PowerGREP - Quickly search through large numbers of files on your PC or network using powerful text patterns to find exactly the information you want. Search and replace with plain text or regular expressions to maintain web sites, source code, reports, ...