NeverBounce - Real-time email verification and cleaning to ensure emails never bounce.
grepWin - grepWin is a simple search and replace tool which can use PCRE regular expressions to search for...
Email List Verify - The Fastest Way to Improve Email List Deliverability and ROI
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, ...
ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
dnGREP - dnGrep allows you to search across files with easy-to-read results.