Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
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, ...
Wondershare PDFelement - All-in-one PDF editor
regexxer - regexxer is a nifty GUI search/replace tool featuring Perl-style regular expressions.
Microsoft Word - Microsoft Word is a commercial word document processor for Windows.
dnGREP - dnGrep allows you to search across files with easy-to-read results.