1)   Spam Buster 1.10.2
Delete junk e-mail from 12 pop accounts, can run in system tray, includes customizable list of rules and statistics. Top 10 spammers and spam domains. List of friends and custom rules to suit your personal situation.

 2)   Ad Nuker Popup Blocker & Spam Filter 4.6.0.0
Filter Junk E-Mail Spam, Ads, Pop Ups advertising, Viruses, Tojans & Spyware. Works with POP3 & IMAP. This FREE tool uses intelligent filtering of annoying Popup ads, e-mail spam, Spyware, Adware, Trojans, Viruses, Spyware Cookies and much much more

 3)   Spam Nullifier Pro 3.7.0.2
Eliminate Junk E-Mail Spam, Viruses, Tojans & Spyware. Works with POP3, IMAP, HTTP. Spam Nullifier is a powerful e-mail checker programs with effective spam elimination. This FREE Anti Spam Filter stops unwanted viruses, trojans & spam e-mails.

 4)   Spam Nullifier 3.4.0.1
Eliminate Junk E-Mail Spam, Viruses, Tojans & Spyware. Works with POP3 & IMAP. Spam Nullifier is a powerful e-mail checker programs with effective spam elimination. This FREE Anti Spam Filter stops unwanted viruses, trojans & spam e-mails.