Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.

Zopim - Live chat is a faster and more personal way for you to engage your customers. Free for 14 days. No credit card required.

Live Chat by Sumo.com - Instantly communicate with customers, prospects & visitors

Crisp Chat - Multi-channel customer support software

Zendesk for Startups - Everything you need for seamless customer conversations.

Mutiny - Personalize your website for each visitor