emv is a tool for mass-renaming files with a text editor. It can perform two pass renaming, link creation, file list splitting, and link target editing. emv logs its actions as shell-script-style mv commands in case you want to undo them. It is quite capable when used with the Vim text editor's visual block changes. emv can also be used non-interactively by providing a Perl expression for renaming files. It's especially useful if you want to see all the files at once and want to think about their names while editing and changing whole groups of files.
IMac Mailer is a mass mailer capable of sending thousands of personalized email messages an hour to an unlimited number of mailing lists. It automates mail recipient subscription, removal, and bounce management. An import/export feature lets you move email addresses between iMac Mailer and Address Book, Microsoft Excel, Apple Numbers, CSV, or tab delimited text files and so on.