dnGREP - dnGrep allows you to search across files with easy-to-read results.
Batch Docs - 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.
AstroGrep - AstroGrep is A Microsoft Windows GUI File Searching (grep) utility.
Multi String Replacer - Replace multiple strings at once!
Agent Ransack - Agent Ransack is a tool for finding files and information on your hard drive fast and efficiently.
regexxer - regexxer is a nifty GUI search/replace tool featuring Perl-style regular expressions.