Add-ons for Thunderbird: Add-ons are extensions and other additions that add new functionality to Thunderbird or change its appearance

Alpine Information Center: This project is the continuation of the Pine project under a new license

Eudora: Free download of full-featured e-mail client for Windows and Macintosh users. Qualcomm Incorporated

Microsoft Outlook: Official product pages for personal information manager and communications program

Mutt: A small but very powerful text-based mail client for Unix operating systems. News, documentation, software download, bug reporting system and mailing list

Pine Information Center: Official web page about this mail program by Computing and Communications at the University of Washington

Procmail Spam Filter: The Spam Bouncer: The Spam Bouncer is a set of Procmail filters for trapping and discarding spam, and autocomplaining to the senders and their upstream sites

Thunderbird: Official site. Open source cross-platform email and Usenet client based on Mozilla code. Features intelligent spam filters, built-in RSS reader, and quick search