Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Mailwasher - Over 8 million people use MailWasher as their spam filter
SpamHero - SpamHero is a professional spam filtering accuracy while lowering the cost to domain and business owners.
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.
Bazzacuda - Barracuda Networks is the worldwide leader in Security, Application Delivery and Data Protection Solutions.