1)   Spam Crusher 1.1A
Spam Crusher is designed to filter unwanted email, while allowing the email you want to receive. Spam Crusher can be configured to filter multiple email accounts. Spam Crusher is really easy to set up. In just a few minutes you can be up and running.

 2)   SPAMReporter 2.0
A powerful automatic SPAM Reporting tool that lets you help the ISPs shut Spam down at the source by identifying the source of the Spam. Much more effective for fighting Spam than simply filtering it.

 3)   SpamAI Anti-Spam Filter Software DR-1.80.4
SpamAI filters 95-99% of spam without annoying challenges or false blacklisting. SpamAI filters the entire message and headers using sophisticated pattern match. SpamAI auto-updates rules over the web. SpamAI operates in single- or multi-user mode.

 4)   SpamAid 4.0
SpamAid is an easy-to-use MS Outlook add-on to protect your Inbox against spam. Bayesian filtering technology. Auto-learning Ability. Quarantined e-mails are stored in a separate SPAM folder. POP3, IMAP, HTTP and MS Exchange support.