mat2 - mat2 is a metadata removal tool, supporting a wide range of commonly used file formats.
SearchMyFiles - Alternative to the standard Search For Files And Folders module of Windows. Duplicates search is also supported.
Attribute Magic - AttributeMagic.com - utility to change file timestamps and metadata
dnGREP - dnGrep allows you to search across files with easy-to-read results.
GroupDocs.Metadata for .NET - GroupDocs.Metadata for .
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, ...