Mailwasher - Over 8 million people use MailWasher as their spam filter
SpamTitan - Comprehensive Email Protection. 99.99% Spam Detection. Blocks phishing, viruses, malware and other email threats.
SPAMfighter - SPAMfighter and Microsoft have built the strongest and most effective anti spam filter for Outlook, Windows Live Mail, Outlook Express & Thunderbird
Sanebox - SaneBox is a cloud-based service that allows users to filter and manage their emails.
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.
ZeroSpam - Cloud email security & anti-spam solution