grepWin - grepWin is a simple search and replace tool which can use PCRE regular expressions to search for...
AstroGrep - AstroGrep is A Microsoft Windows GUI File Searching (grep) utility.
dnGREP - dnGrep allows you to search across files with easy-to-read results.
Agent Ransack - Agent Ransack is a tool for finding files and information on your hard drive fast and efficiently.
The Silver Searcher - A code searching tool similar to ack, with a focus on speed.
DocFetcher - DocFetcher is a portable German/English open source desktop search application.