Total Commander - A Shareware file manager for Windows® 95/98/ME/NT/2000/XP/Vista/7, and Windows® 3.1.
grep - grep is a command-line utility for searching plain-text data sets for lines matching a regular...
Double Commander - Double Commander is a cross-platform open source file manager with two panels side by side.
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, ...
XYplorer - File Manager for Windows
dnGREP - dnGrep allows you to search across files with easy-to-read results.