grepWin is particularly recommended for software developers, system administrators, and data analysts who frequently work with log files, codebases, or any large sets of text files. It's also useful for any Windows users who are comfortable with regular expressions and need a reliable and powerful search-and-replace functionality in their workflow.
dnGREP - dnGrep allows you to search across files with easy-to-read results.
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.
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, ...
grep - grep is a command-line utility for searching plain-text data sets for lines matching a regular...
Text Workbench - Text Workbench is the universal search and replace tool featuring full Unicode and UTF-8 support.