dnGREP - dnGrep allows you to search across files with easy-to-read results.
Extract Emails - Extract Email makes it so easy to create email mailing lists, catalogue contact information, and enjoy cross-platform accessibility.
AstroGrep - AstroGrep is A Microsoft Windows GUI File Searching (grep) utility.
Atomic Email Hunter - Atomic Email Hunter is an incredibly robust tool that specializes in extracting email addresses, along with usernames, from various webpages.
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, ...
Scrape - Gather all website emails in seconds