Batch Word Replace - Replace text in, add or remove content, and edit thousands of Word documents in doc and docx formats, PDFs, RTF documents, and other text documents.
grepWin - grepWin is a simple search and replace tool which can use PCRE regular expressions to search for...
Search and Replace - Don't worry about those many files where you have to change a few things!
DocFetcher - DocFetcher is a portable German/English open source desktop search application.
Actual Search And Replace - This is an advanced tool to perform the search and replace operations across multiple text files. It supports the regular expressions syntax. The batch replace operation allows to execute a lot of various replacements with one click.
dnGREP - dnGrep allows you to search across files with easy-to-read results.