GNU Find Utilities - The GNU Find Utilities are the basic directory searching utilities of the GNU operating system.
grep - grep is a command-line utility for searching plain-text data sets for lines matching a regular...
NTFS-Search - This tool enables users to search their NTFS formatted harddrives within seconds.
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, ...
fd - A simple, fast and user-friendly alternative to 'find'.
dnGREP - dnGrep allows you to search across files with easy-to-read results.