SpoofCard - Disguise your Caller ID
Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
6degrees - Get introductions through your friends' phones
Mailwasher - Over 8 million people use MailWasher as their spam filter
Bad Numbers - A reverse telephone lookup of unwanted calls
SpamAssassin - Use this program to "Unspam" your mailbox(es).