Spam protection software

E-Mail Clients with Spam-Filter:
Mozilla Thunderbird - for free. *my favorite
Microsoft Outlook - commercial.
The Bat! - commercial.
Pegasus Mail - for free.
IncrediMail - for free.
Eudora - commercial.

Spam-Filter:
Spamihilator - Windows, supports most E-Mail clients, for free.
SpamPal - Windows, supports most E-Mail clients, for free.
SPAMfighter - Windows, MS Outlook(-Express), free for private use.
SuperSpamKiller - Windows, supports most E-Mail clients, standard version for free.
SpamAssassin - Linux, Windows, for free. *my favorite

Internet Security Suites (complete solutions: AntiVirus, Firewall, Spam filter):
Kaspersky Internet Security *my favorite

G DATA InternetSecurity *my favorite

Symantec Norton Internet Security
F-Secure Internet Security
Bitdefender Internet Security
Trend Mirco PC-cillin Internet Security
McAfee Internet Security Suite
Grisoft AVG Internet Security
CA Internet Security Suite
Panda Software Internet Security
ZoneAlarm Internet Security Suite

Browser:
Mozilla Firefox - for free. *my favorite
in addition the Firefox Add-ons: NoScript and Adblock - that's all you need.
Opera - for free.