The Silver Searcher - A code searching tool similar to ack, with a focus on speed.
Mailspring - Mailspring is a mail client for Mac, Windows and Linux.
grep - grep is a command-line utility for searching plain-text data sets for lines matching a regular...
Geary - Geary is an email application built for GNOME 3.
dnGREP - dnGrep allows you to search across files with easy-to-read results.
The Bat - The Bat! is a secure desktop email client for Windows, designed to protect your correspondence against third-parties and to save your time.