Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
SpamTitan - Comprehensive Email Protection. 99.99% Spam Detection. Blocks phishing, viruses, malware and other email threats.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
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