Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
Live Chat by Sumo.com - Instantly communicate with customers, prospects & visitors
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Mailwasher - Over 8 million people use MailWasher as their spam filter
GoSquared Live Chat - Beautiful, simple, and free live chat for your website