regexxer - regexxer is a nifty GUI search/replace tool featuring Perl-style regular expressions.
RegEx Lab - RegEx Lab allows you to test regular expressions.
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, ...
dnGREP - dnGrep allows you to search across files with easy-to-read results.
Search & Replace Master - Search & replace the text in your files in seconds.
ApowerPDF - ApowerPDF is a versatile PDF editor which also features as PDF converter, viewer, creator and more. It provides a perfect solution for all users.