DirectSendMail 

DirectSendMail is a powerful group mailer which sends your message directly to the recipient's mail server, without using any SMTP server. Support multi-thread group email send.
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MyLook 

MyLook is a commercial personal/groupware information management (PIM) product developed by SciBit, using an open database structure standard, to be used in a workgroup environment, much like you would use Outlook® & Exchange® for collaboration.
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Addressinator! 

Addressinator! address book software is networkable, searchable, includes customizable field names and placement, group contacts for bulk email features , printing or searching, import and export, easy copy to other programs, and many more features
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Atomic Newsgroup Explorer 

Atomic Newsgroup Explorer is developed to extract both e-mail addresses and user names from the usenet newsgroups. It connects to any NNTP servers and gathers data from any public or private group in multi-threaded mode.
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NotePager Pro 

Send text or SMS messages to pagers, mobile phones, and PIMs using an easy to use desktop application. Send messages through the Internet or a modem. Group messaging, pre-programmed messages and scheduled paging. Send to anyone, anywhere, any time!
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e-war 

A turn based, multiplayer, play by e-mail war game. As large a group as you like can play at any pace the group decides on. (e.g. from one turn a week to several turns a day.) Each turn typically takes only a few minutes to play.
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