Spamihilator - The free Anti-Spam-Filter Spamihilator removes more than 98% of spam mails before they even get into your inbox.
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
tawk.to - tawk.to is a free live chat app that lets you monitor and chat with visitors on your website or from a free customizable page
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.